StringUtils (solo-core 1.3 API)

java.lang.Object
- cn.sexycode.util.core.str.StringUtils

public final class StringUtils
extends Object

作者:: qinzaizhen

嵌套类概要

嵌套类
限定符和类型类和说明

static interface StringUtils.Renderer<T>

嵌套类
限定符和类型	类和说明
`static interface`	`StringUtils.Renderer<T>`

字段概要

字段
限定符和类型	字段和说明
`static String`	`BATCH_ID_PLACEHOLDER`
`(专用程序包) byte[]`	`BYTES_NEW_LINE`
`(专用程序包) String[]`	`EMPTY_ARRAY`
`static String[]`	`EMPTY_STRINGS`
`static int`	`INDEX_NOT_FOUND` Represents a failed index search.
`static String`	`WHITESPACE`

方法概要

所有方法静态方法具体方法已过时的方法
限定符和类型	方法和说明
`static String[]`	`add(String[] x, String sep, String[] y)`
`static String[]`	`addStringToArray(String[] array, String str)` Append the given `String` to the given `String` array, returning a new array consisting of the input array contents plus the given `String`.
`static String`	`applyRelativePath(String path, String relativePath)` Apply the given relative path to the given Java resource path, assuming standard Java folder separation (i.e. "/" separators).
`static String`	`arrayToCommaDelimitedString(Object[] arr)` Convert a `String` array into a comma delimited `String` (i.e., CSV).
`static String`	`arrayToDelimitedString(Object[] arr, String delim)` Convert a `String` array into a delimited `String` (e.g.
`static boolean`	`booleanValue(String tfString)`
`static String`	`camelhumpToUnderline(String str)` 将驼峰风格替换为下划线风格
`static String`	`capitalize(String str)` Capitalize a `String`, changing the first letter to upper case as per `Character.toUpperCase(char)`.
`static String`	`cleanPath(String path)` Normalize the path by suppressing sequences like "path/.." and inner simple dots.
`static String`	`collapse(String name)` Collapses a name.
`static String`	`collapseQualifier(String qualifier, boolean includeDots)` Given a qualifier, collapse it.
`static String`	`collapseQualifierBase(String name, String qualifierBase)` Cross between `collapse(java.lang.String)` and `partiallyUnqualify(java.lang.String, java.lang.String)`.
`static String`	`collectionToCommaDelimitedString(Collection<?> coll)` Convert a `Collection` into a delimited `String` (e.g., CSV).
`static String`	`collectionToDelimitedString(Collection<?> coll, String delim)` Convert a `Collection` into a delimited `String` (e.g.
`static String`	`collectionToDelimitedString(Collection<?> coll, String delim, String prefix, String suffix)` Convert a `Collection` to a delimited `String` (e.g.
`static Set<String>`	`commaDelimitedListToSet(String str)` Convert a comma delimited list (e.g., a row from a CSV file) into a set.
`static String[]`	`commaDelimitedListToStringArray(String str)` Convert a comma delimited list (e.g., a row from a CSV file) into an array of strings.
`static String[]`	`concatenateStringArrays(String[] array1, String[] array2)` Concatenate the given `String` arrays into one, with overlapping array elements included twice.
`static boolean`	`containsWhitespace(CharSequence str)` Check whether the given `CharSequence` contains any whitespace characters.
`static boolean`	`containsWhitespace(String str)` Check whether the given `String` contains any whitespace characters.
`static String`	`convertByStyle(String str, Style style)` 根据指定的样式进行转换
`static int`	`countOccurrencesOf(String str, String sub)` Count the occurrences of the substring `sub` in string `str`.
`static int`	`countUnquoted(String string, char character)`
`static String`	`delete(String inString, String pattern)` Delete all occurrences of the given substring.
`static String`	`deleteAny(String inString, String charsToDelete)` Delete any character in a given `String`.
`static String[]`	`delimitedListToStringArray(String str, String delimiter)` Take a `String` that is a delimited list and convert it into a `String` array.
`static String[]`	`delimitedListToStringArray(String str, String delimiter, String charsToDelete)` Take a `String` that is a delimited list and convert it into a `String` array.
`static boolean`	`endsWithIgnoreCase(String str, String suffix)` Test if the given `String` ends with the specified suffix, ignoring upper/lower case.
`static int`	`firstIndexOfChar(String sqlString, BitSet keys, int startindex)`
`static int`	`firstIndexOfChar(String sqlString, String string, int startindex)`
`static String`	`generateAlias(String description)`
`static String`	`generateAlias(String description, int unique)` Generate a nice alias for the given class name or collection role name and unique integer.
`static String`	`getFilename(String path)` Extract the filename from the given Java resource path, e.g.
`static String`	`getFilenameExtension(String path)` Extract the filename extension from the given Java resource path, e.g.
`static char`	`getFirstNonWhitespaceCharacter(String str)`
`static char`	`getLastNonWhitespaceCharacter(String str)`
`static boolean`	`hasLength(CharSequence str)` Check that the given `CharSequence` is neither `null` nor of length 0.
`static boolean`	`hasLength(String str)` Check that the given `String` is neither `null` nor of length 0.
`static boolean`	`hasText(CharSequence str)` Check whether the given `CharSequence` contains actual text.
`static boolean`	`hasText(String str)` Check whether the given `String` contains actual text.
`static int`	`indexOf(CharSequence seq, CharSequence searchSeq)` Finds the first index within a CharSequence, handling `null`.
`static int`	`indexOf(CharSequence seq, CharSequence searchSeq, int startPos)` Finds the first index within a CharSequence, handling `null`.
`static boolean`	`isEmpty(CharSequence string)`
`static boolean`	`isEmpty(Object str)` Check whether the given `String` is empty.
`static boolean`	`isEmptyOrWhiteSpace(String string)`
`static boolean`	`isLowercaseAlpha(char c)`
`static boolean`	`isNotEmpty(CharSequence string)`
`static boolean`	`isQuoted(String name)` Determine if the given string is quoted (wrapped by '`' characters at beginning and end).
`static boolean`	`isUppercaseAlpha(char c)`
`static <T> String`	`join(Collection<T> values, StringUtils.Renderer<T> renderer)`
`static String`	`join(String separator, Iterable objects)`
`static String`	`join(String seperator, Iterator objects)`
`static String`	`join(String seperator, String[] strings)`
`static <T> String`	`join(T[] values, StringUtils.Renderer<T> renderer)`
`static String`	`joinWithQualifierAndSuffix(String[] values, String qualifier, String suffix, String deliminator)`
`static int`	`lastIndexOf(CharSequence seq, CharSequence searchSeq)` Finds the last index within a CharSequence, handling `null`.
`static int`	`lastIndexOf(CharSequence seq, int searchChar)` Returns the index within `seq` of the last occurrence of the specified character.
`static int`	`lastIndexOf(CharSequence seq, int searchChar, int startPos)` Returns the index within `seq` of the last occurrence of the specified character, searching backward starting at the specified index.
`static int`	`lastIndexOfLetter(String string)`
`static int[]`	`locateUnquoted(String string, char character)`
`static String[]`	`mergeStringArrays(String[] array1, String[] array2)` 已过时。 as of 4.3.15, in favor of manual merging via `LinkedHashSet` (with every entry included at most once, even entries within the first array)
`static String`	`moveAndToBeginning(String filter)`
`static String[]`	`multiply(String string, Iterator placeholders, Iterator replacements)`
`static String`	`nullIfEmpty(String value)`
`static List<String>`	`parseCommaSeparatedString(String incomingString)`
`static Locale`	`parseLocale(String localeValue)` Parse the given `String` value into a `Locale`, accepting the `Locale.toString()` format as well as BCP 47 language tags.
`static Locale`	`parseLocaleString(String localeString)` Parse the given `String` representation into a `Locale`.
`static TimeZone`	`parseTimeZoneString(String timeZoneString)` Parse the given `timeZoneString` value into a `TimeZone`.
`static String`	`partiallyUnqualify(String name, String qualifierBase)` Partially unqualifies a qualified name.
`static boolean`	`pathEquals(String path1, String path2)` Compare two paths after normalization of them.
`static String`	`qualifier(String qualifiedName)`
`static String`	`qualify(String prefix, String name)`
`static String[]`	`qualify(String prefix, String[] names)`
`static String`	`qualifyConditionally(String prefix, String name)`
`static String[]`	`qualifyIfNot(String prefix, String[] names)`
`static String`	`quote(String name)` Return a representation of the given name ensuring quoting (wrapped with '`' characters).
`static Object`	`quoteIfString(Object obj)` Turn the given Object into a `String` with single quotes if it is a `String`; keeping the Object as-is else.
`static String[]`	`removeDuplicateStrings(String[] array)` Remove duplicate strings from the given array.
`static String`	`repeat(char character, int times)`
`static String`	`repeat(String string, int times)`
`static String`	`repeat(String string, int times, String deliminator)`
`static String[]`	`replace(String[] templates, String placeholder, String replacement)`
`static String`	`replace(String template, String placeholder, String replacement)`
`static String`	`replace(String template, String placeholder, String replacement, boolean wholeWords)`
`static String`	`replace(String template, String placeholder, String replacement, boolean wholeWords, boolean encloseInParensIfNecessary)`
`static String`	`replace(String beforePlaceholder, String afterPlaceholder, String placeholder, String replacement, boolean wholeWords, boolean encloseInParensIfNecessary)`
`static String`	`replaceOnce(String template, String placeholder, String replacement)`
`static String`	`root(String qualifiedName)`
`static String[]`	`sortStringArray(String[] array)` Turn given source `String` array into sorted array.
`static String[]`	`split(String toSplit, String delimiter)` Split a `String` at the first occurrence of the delimiter.
`static String[]`	`split(String separators, String list, boolean include)`
`static Properties`	`splitArrayElementsIntoProperties(String[] array, String delimiter)` Take an array of strings and split each element based on the given delimiter.
`static Properties`	`splitArrayElementsIntoProperties(String[] array, String delimiter, String charsToDelete)` Take an array of strings and split each element based on the given delimiter.
`static String[]`	`splitTrimmingTokens(String separators, String list, boolean include)`
`static boolean`	`startsWithIgnoreCase(String str, String prefix)` Test if the given `String` starts with the specified prefix, ignoring upper/lower case.
`static String`	`stripFilenameExtension(String path)` Strip the filename extension from the given Java resource path, e.g.
`static String`	`substring(String str, int start)` Gets a substring from the specified String avoiding exceptions.
`static String`	`substring(String str, int start, int end)` Gets a substring from the specified String avoiding exceptions.
`static boolean`	`substringMatch(CharSequence str, int index, CharSequence substring)` Test whether the given string matches the given substring at the given index.
`static String[]`	`suffix(String[] columns, String suffix)`
`static String[]`	`toArrayElement(String s)` Takes a String s and returns a new String[1] with s as the only element.
`static String[]`	`tokenizeToStringArray(String str, String delimiters)` Tokenize the given `String` into a `String` array via a `StringTokenizer`.
`static String[]`	`tokenizeToStringArray(String str, String delimiters, boolean trimTokens, boolean ignoreEmptyTokens)` Tokenize the given `String` into a `String` array via a `StringTokenizer`.
`static String`	`toLanguageTag(Locale locale)` 已过时。 as of 5.0.4, in favor of `Locale.toLanguageTag()`
`static char`	`toLowerAscii(char c)`
`static String`	`toString(Object[] array)`
`static String[]`	`toStringArray(Collection<String> collection)` Copy the given `Collection` into a `String` array.
`static String[]`	`toStringArray(Enumeration<String> enumeration)` Copy the given Enumeration into a `String` array.
`static char`	`toUpperAscii(char c)`
`static String`	`trimAllWhitespace(String str)` Trim all whitespace from the given `String`: leading, trailing, and in between characters.
`static String[]`	`trimArrayElements(String[] array)` Trim the elements of the given `String` array, calling `String.trim()` on each of them.
`static String`	`trimLeadingCharacter(String str, char leadingCharacter)` Trim all occurrences of the supplied leading character from the given `String`.
`static String`	`trimLeadingWhitespace(String str)` Trim leading whitespace from the given `String`.
`static String`	`trimTrailingCharacter(String str, char trailingCharacter)` Trim all occurrences of the supplied trailing character from the given `String`.
`static String`	`trimTrailingWhitespace(String str)` Trim trailing whitespace from the given `String`.
`static String`	`trimWhitespace(String str)` Trim leading and trailing whitespace from the given `String`.
`static String`	`truncate(String string, int length)`
`static String`	`uncapitalize(String str)` Uncapitalize a `String`, changing the first letter to lower case as per `Character.toLowerCase(char)`.
`static String`	`underlineToCamelhump(String str)` 将下划线风格替换为驼峰风格
`static String`	`unqualify(String qualifiedName)`
`static String`	`unqualify(String qualifiedName, char separator)` Unqualify a string qualified by a separator character.
`static String`	`unqualifyEntityName(String entityName)`
`static String`	`unquote(String name)` Return the unquoted version of name (stripping the start and end '`' characters if present).
`static String`	`unroot(String qualifiedName)`
`static String`	`uriDecode(String source, Charset charset)` Decode the given encoded URI component value.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - INDEX_NOT_FOUND
```
public static final int INDEX_NOT_FOUND
```
    Represents a failed index search.
    
    从以下版本开始:
    
    2.1
    
    另请参阅:
    
    常量字段值
  - EMPTY_ARRAY
```
String[] EMPTY_ARRAY
```
  - BYTES_NEW_LINE
```
byte[] BYTES_NEW_LINE
```
  - WHITESPACE
```
public static final String WHITESPACE
```
    另请参阅:
    
    常量字段值
  - EMPTY_STRINGS
```
public static final String[] EMPTY_STRINGS
```
  - BATCH_ID_PLACEHOLDER
```
public static final String BATCH_ID_PLACEHOLDER
```
    另请参阅:
    
    常量字段值
- 方法详细资料
  - lastIndexOfLetter
```
public static int lastIndexOfLetter(String string)
```
  - join
```
public static String join(String seperator,
                          String[] strings)
```
  - joinWithQualifierAndSuffix
```
public static String joinWithQualifierAndSuffix(String[] values,
                                                String qualifier,
                                                String suffix,
                                                String deliminator)
```
  - join
```
public static String join(String seperator,
                          Iterator objects)
```
  - join
```
public static String join(String separator,
                          Iterable objects)
```
  - add
```
public static String[] add(String[] x,
                           String sep,
                           String[] y)
```
  - repeat
```
public static String repeat(String string,
                            int times)
```
  - repeat
```
public static String repeat(String string,
                            int times,
                            String deliminator)
```
  - repeat
```
public static String repeat(char character,
                            int times)
```
  - replace
```
public static String replace(String template,
                             String placeholder,
                             String replacement)
```
  - replace
```
public static String[] replace(String[] templates,
                               String placeholder,
                               String replacement)
```
  - replace
```
public static String replace(String template,
                             String placeholder,
                             String replacement,
                             boolean wholeWords)
```
  - replace
```
public static String replace(String template,
                             String placeholder,
                             String replacement,
                             boolean wholeWords,
                             boolean encloseInParensIfNecessary)
```
  - replace
```
public static String replace(String beforePlaceholder,
                             String afterPlaceholder,
                             String placeholder,
                             String replacement,
                             boolean wholeWords,
                             boolean encloseInParensIfNecessary)
```
  - getLastNonWhitespaceCharacter
```
public static char getLastNonWhitespaceCharacter(String str)
```
  - getFirstNonWhitespaceCharacter
```
public static char getFirstNonWhitespaceCharacter(String str)
```
  - replaceOnce
```
public static String replaceOnce(String template,
                                 String placeholder,
                                 String replacement)
```
  - split
```
public static String[] split(String separators,
                             String list,
                             boolean include)
```
  - splitTrimmingTokens
```
public static String[] splitTrimmingTokens(String separators,
                                           String list,
                                           boolean include)
```
  - unqualify
```
public static String unqualify(String qualifiedName)
```
  - qualifier
```
public static String qualifier(String qualifiedName)
```
  - collapse
```
public static String collapse(String name)
```
    Collapses a name. Mainly intended for use with classnames, where an example might serve best to explain. Imagine you have a class named 'org.hibernate.internal.util.StringHelper'; calling collapse on that classname will result in 'o.h.u.StringHelper'.
    
    参数:
    
    name - The name to collapse.
    
    返回:
    
    The collapsed name.
  - collapseQualifier
```
public static String collapseQualifier(String qualifier,
                                       boolean includeDots)
```
    Given a qualifier, collapse it.
    
    参数:
    
    qualifier - The qualifier to collapse.
    
    includeDots - Should we include the dots in the collapsed form?
    
    返回:
    
    The collapsed form.
  - partiallyUnqualify
```
public static String partiallyUnqualify(String name,
                                        String qualifierBase)
```
    Partially unqualifies a qualified name. For example, with a base of 'org.hibernate' the name 'org.hibernate.internal.util.StringHelper' would become 'util.StringHelper'.
    
    参数:
    
    name - The (potentially) qualified name.
    
    qualifierBase - The qualifier base.
    
    返回:
    
    The name itself, or the partially unqualified form if it begins with the qualifier base.
  - collapseQualifierBase
```
public static String collapseQualifierBase(String name,
                                           String qualifierBase)
```
    Cross between collapse(java.lang.String) and partiallyUnqualify(java.lang.String, java.lang.String). Functions much like collapse(java.lang.String) except that only the qualifierBase is collapsed. For example, with a base of 'org.hibernate' the name 'org.hibernate.internal.util.StringHelper' would become 'o.h.util.StringHelper'.
    
    参数:
    
    name - The (potentially) qualified name.
    
    qualifierBase - The qualifier base.
    
    返回:
    
    The name itself if it does not begin with the qualifierBase, or the properly collapsed form otherwise.
  - suffix
```
public static String[] suffix(String[] columns,
                              String suffix)
```
  - root
```
public static String root(String qualifiedName)
```
  - unroot
```
public static String unroot(String qualifiedName)
```
  - booleanValue
```
public static boolean booleanValue(String tfString)
```
  - toString
```
public static String toString(Object[] array)
```
  - multiply
```
public static String[] multiply(String string,
                                Iterator placeholders,
                                Iterator replacements)
```
  - countUnquoted
```
public static int countUnquoted(String string,
                                char character)
```
  - locateUnquoted
```
public static int[] locateUnquoted(String string,
                                   char character)
```
  - isNotEmpty
```
public static boolean isNotEmpty(CharSequence string)
```
  - isEmpty
```
public static boolean isEmpty(CharSequence string)
```
  - isEmptyOrWhiteSpace
```
public static boolean isEmptyOrWhiteSpace(String string)
```
  - qualify
```
public static String qualify(String prefix,
                             String name)
```
  - qualifyConditionally
```
public static String qualifyConditionally(String prefix,
                                          String name)
```
  - qualify
```
public static String[] qualify(String prefix,
                               String[] names)
```
  - qualifyIfNot
```
public static String[] qualifyIfNot(String prefix,
                                    String[] names)
```
  - firstIndexOfChar
```
public static int firstIndexOfChar(String sqlString,
                                   BitSet keys,
                                   int startindex)
```
  - firstIndexOfChar
```
public static int firstIndexOfChar(String sqlString,
                                   String string,
                                   int startindex)
```
  - truncate
```
public static String truncate(String string,
                              int length)
```
  - generateAlias
```
public static String generateAlias(String description)
```
  - generateAlias
```
public static String generateAlias(String description,
                                   int unique)
```
    Generate a nice alias for the given class name or collection role name and unique integer. Subclasses of Loader do not have to use aliases of this form.
    
    参数:
    
    description - The base name (usually an entity-name or collection-role)
    
    unique - A uniquing value
    
    返回:
    
    an alias of the form foo1_
  - unqualifyEntityName
```
public static String unqualifyEntityName(String entityName)
```
  - moveAndToBeginning
```
public static String moveAndToBeginning(String filter)
```
  - isQuoted
```
public static boolean isQuoted(String name)
```
    Determine if the given string is quoted (wrapped by '`' characters at beginning and end).
    
    参数:
    
    name - The name to check.
    
    返回:
    
    True if the given string starts and ends with '`'; false otherwise.
  - quote
```
public static String quote(String name)
```
    Return a representation of the given name ensuring quoting (wrapped with '`' characters). If already wrapped return name.
    
    参数:
    
    name - The name to quote.
    
    返回:
    
    The quoted version.
  - unquote
```
public static String unquote(String name)
```
    Return the unquoted version of name (stripping the start and end '`' characters if present).
    
    参数:
    
    name - The name to be unquoted.
    
    返回:
    
    The unquoted version.
  - toArrayElement
```
public static String[] toArrayElement(String s)
```
    Takes a String s and returns a new String[1] with s as the only element. If s is null or "", return String[0].
    
    参数:
    
    s -
    
    返回:
    
    String[]
  - nullIfEmpty
```
public static String nullIfEmpty(String value)
```
  - parseCommaSeparatedString
```
public static List<String> parseCommaSeparatedString(String incomingString)
```
  - join
```
public static <T> String join(Collection<T> values,
                              StringUtils.Renderer<T> renderer)
```
  - join
```
public static <T> String join(T[] values,
                              StringUtils.Renderer<T> renderer)
```
  - convertByStyle
```
public static String convertByStyle(String str,
                                    Style style)
```
    根据指定的样式进行转换
    
    参数:
    
    str -
    
    style -
    
    返回:
  - camelhumpToUnderline
```
public static String camelhumpToUnderline(String str)
```
    将驼峰风格替换为下划线风格
  - underlineToCamelhump
```
public static String underlineToCamelhump(String str)
```
    将下划线风格替换为驼峰风格
  - isUppercaseAlpha
```
public static boolean isUppercaseAlpha(char c)
```
  - isLowercaseAlpha
```
public static boolean isLowercaseAlpha(char c)
```
  - toUpperAscii
```
public static char toUpperAscii(char c)
```
  - toLowerAscii
```
public static char toLowerAscii(char c)
```
  - indexOf
```
public static int indexOf(CharSequence seq,
                          CharSequence searchSeq,
                          int startPos)
```
    Finds the first index within a CharSequence, handling null. This method uses String.indexOf(String, int) if possible.
    
    A null CharSequence will return -1. A negative start position is treated as zero. An empty ("") search CharSequence always matches. A start position greater than the string length only matches an empty search CharSequence.
```
 StringUtils.indexOf(null, *, *)          = -1
 StringUtils.indexOf(*, null, *)          = -1
 StringUtils.indexOf("", "", 0)           = 0
 StringUtils.indexOf("", *, 0)            = -1 (except when * = "")
 StringUtils.indexOf("aabaabaa", "a", 0)  = 0
 StringUtils.indexOf("aabaabaa", "b", 0)  = 2
 StringUtils.indexOf("aabaabaa", "ab", 0) = 1
 StringUtils.indexOf("aabaabaa", "b", 3)  = 5
 StringUtils.indexOf("aabaabaa", "b", 9)  = -1
 StringUtils.indexOf("aabaabaa", "b", -1) = 2
 StringUtils.indexOf("aabaabaa", "", 2)   = 2
 StringUtils.indexOf("abc", "", 9)        = 3
 
```
    参数:
    
    seq - the CharSequence to check, may be null
    
    searchSeq - the CharSequence to find, may be null
    
    startPos - the start position, negative treated as zero
    
    返回:
    
    the first index of the search CharSequence (always ≥ startPos), -1 if no match or null string input
    
    从以下版本开始:
    
    2.0, 3.0 Changed signature from indexOf(String, String, int) to indexOf(CharSequence, CharSequence, int)
  - indexOf
```
public static int indexOf(CharSequence seq,
                          CharSequence searchSeq)
```
    Finds the first index within a CharSequence, handling null. This method uses String.indexOf(String, int) if possible.
    
    A null CharSequence will return -1.
```
 StringUtils.indexOf(null, *)          = -1
 StringUtils.indexOf(*, null)          = -1
 StringUtils.indexOf("", "")           = 0
 StringUtils.indexOf("", *)            = -1 (except when * = "")
 StringUtils.indexOf("aabaabaa", "a")  = 0
 StringUtils.indexOf("aabaabaa", "b")  = 2
 StringUtils.indexOf("aabaabaa", "ab") = 1
 StringUtils.indexOf("aabaabaa", "")   = 0
 
```
    参数:
    
    seq - the CharSequence to check, may be null
    
    searchSeq - the CharSequence to find, may be null
    
    返回:
    
    the first index of the search CharSequence, -1 if no match or null string input
    
    从以下版本开始:
    
    2.0, 3.0 Changed signature from indexOf(String, String) to indexOf(CharSequence, CharSequence)
  - lastIndexOf
```
public static int lastIndexOf(CharSequence seq,
                              int searchChar)
```
    Returns the index within seq of the last occurrence of the specified character. For values of searchChar in the range from 0 to 0xFFFF (inclusive), the index (in Unicode code units) returned is the largest value k such that:
    this.charAt(k) == searchChar
    is true. For other values of searchChar, it is the largest value k such that:
    this.codePointAt(k) == searchChar
    is true. In either case, if no such character occurs in this string, then -1 is returned. Furthermore, a null or empty ("") CharSequence will return -1. The seq CharSequence object is searched backwards starting at the last character.
```
 StringUtils.lastIndexOf(null, *)         = -1
 StringUtils.lastIndexOf("", *)           = -1
 StringUtils.lastIndexOf("aabaabaa", 'a') = 7
 StringUtils.lastIndexOf("aabaabaa", 'b') = 5
 
```
    参数:
    
    seq - the CharSequence to check, may be null
    
    searchChar - the character to find
    
    返回:
    
    the last index of the search character, -1 if no match or null string input
    
    从以下版本开始:
    
    2.0, 3.0 Changed signature from lastIndexOf(String, int) to lastIndexOf(CharSequence, int), 3.6 Updated CharSequenceUtils call to behave more like String
  - lastIndexOf
```
public static int lastIndexOf(CharSequence seq,
                              int searchChar,
                              int startPos)
```
    Returns the index within seq of the last occurrence of the specified character, searching backward starting at the specified index. For values of searchChar in the range from 0 to 0xFFFF (inclusive), the index returned is the largest value k such that:
    (this.charAt(k) == searchChar) && (k <= startPos)
    is true. For other values of searchChar, it is the largest value k such that:
    (this.codePointAt(k) == searchChar) && (k <= startPos)
    is true. In either case, if no such character occurs in seq at or before position startPos, then -1 is returned. Furthermore, a null or empty ("") CharSequence will return -1. A start position greater than the string length searches the whole string. The search starts at the startPos and works backwards; matches starting after the start position are ignored.
    All indices are specified in char values (Unicode code units).
```
 StringUtils.lastIndexOf(null, *, *)          = -1
 StringUtils.lastIndexOf("", *,  *)           = -1
 StringUtils.lastIndexOf("aabaabaa", 'b', 8)  = 5
 StringUtils.lastIndexOf("aabaabaa", 'b', 4)  = 2
 StringUtils.lastIndexOf("aabaabaa", 'b', 0)  = -1
 StringUtils.lastIndexOf("aabaabaa", 'b', 9)  = 5
 StringUtils.lastIndexOf("aabaabaa", 'b', -1) = -1
 StringUtils.lastIndexOf("aabaabaa", 'a', 0)  = 0
 
```
    参数:
    
    seq - the CharSequence to check, may be null
    
    searchChar - the character to find
    
    startPos - the start position
    
    返回:
    
    the last index of the search character (always ≤ startPos), -1 if no match or null string input
    
    从以下版本开始:
    
    2.0, 3.0 Changed signature from lastIndexOf(String, int, int) to lastIndexOf(CharSequence, int, int)
  - lastIndexOf
```
public static int lastIndexOf(CharSequence seq,
                              CharSequence searchSeq)
```
    Finds the last index within a CharSequence, handling null. This method uses String.lastIndexOf(String) if possible.
    
    A null CharSequence will return -1.
```
 StringUtils.lastIndexOf(null, *)          = -1
 StringUtils.lastIndexOf(*, null)          = -1
 StringUtils.lastIndexOf("", "")           = 0
 StringUtils.lastIndexOf("aabaabaa", "a")  = 7
 StringUtils.lastIndexOf("aabaabaa", "b")  = 5
 StringUtils.lastIndexOf("aabaabaa", "ab") = 4
 StringUtils.lastIndexOf("aabaabaa", "")   = 8
 
```
    参数:
    
    seq - the CharSequence to check, may be null
    
    searchSeq - the CharSequence to find, may be null
    
    返回:
    
    the last index of the search String, -1 if no match or null string input
    
    从以下版本开始:
    
    2.0, 3.0 Changed signature from lastIndexOf(String, String) to lastIndexOf(CharSequence, CharSequence)
  - substring
```
public static String substring(String str,
                               int start)
```
    Gets a substring from the specified String avoiding exceptions.
    
    A negative start position can be used to start n characters from the end of the String.
    
    A null String will return null. An empty ("") String will return "".
```
 StringUtils.substring(null, *)   = null
 StringUtils.substring("", *)     = ""
 StringUtils.substring("abc", 0)  = "abc"
 StringUtils.substring("abc", 2)  = "c"
 StringUtils.substring("abc", 4)  = ""
 StringUtils.substring("abc", -2) = "bc"
 StringUtils.substring("abc", -4) = "abc"
 
```
    参数:
    
    str - the String to get the substring from, may be null
    
    start - the position to start from, negative means count back from the end of the String by this many characters
    
    返回:
    
    substring from start position, null if null String input
  - substring
```
public static String substring(String str,
                               int start,
                               int end)
```
    Gets a substring from the specified String avoiding exceptions.
    
    A negative start position can be used to start/end n characters from the end of the String.
    
    The returned substring starts with the character in the start position and ends before the end position. All position counting is zero-based -- i.e., to start at the beginning of the string use start = 0. Negative start and end positions can be used to specify offsets relative to the end of the String.
    
    If start is not strictly to the left of end, "" is returned.
```
 StringUtils.substring(null, *, *)    = null
 StringUtils.substring("", * ,  *)    = "";
 StringUtils.substring("abc", 0, 2)   = "ab"
 StringUtils.substring("abc", 2, 0)   = ""
 StringUtils.substring("abc", 2, 4)   = "c"
 StringUtils.substring("abc", 4, 6)   = ""
 StringUtils.substring("abc", 2, 2)   = ""
 StringUtils.substring("abc", -2, -1) = "b"
 StringUtils.substring("abc", -4, 2)  = "ab"
 
```
    参数:
    
    str - the String to get the substring from, may be null
    
    start - the position to start from, negative means count back from the end of the String by this many characters
    
    end - the position to end at (exclusive), negative means count back from the end of the String by this many characters
    
    返回:
    
    substring from start position to end position, null if null String input
  - isEmpty
```
public static boolean isEmpty(Object str)
```
    Check whether the given String is empty.
    This method accepts any Object as an argument, comparing it to null and the empty String. As a consequence, this method will never return true for a non-null non-String object.
    The Object signature is useful for general attribute handling code that commonly deals with Strings but generally has to iterate over Objects since attributes may e.g. be primitive value objects as well.
    
    参数:
    
    str - the candidate String
    
    从以下版本开始:
    
    3.2.1
  - hasLength
```
public static boolean hasLength(CharSequence str)
```
    Check that the given CharSequence is neither null nor of length 0.
    Note: this method returns true for a CharSequence that purely consists of whitespace.
```
 StringUtils.hasLength(null) = false
 StringUtils.hasLength("") = false
 StringUtils.hasLength(" ") = true
 StringUtils.hasLength("Hello") = true
 
```
    参数:
    
    str - the CharSequence to check (may be null)
    
    返回:
    
    true if the CharSequence is not null and has length
    
    另请参阅:
    
    hasText(String)
  - hasLength
```
public static boolean hasLength(String str)
```
    Check that the given String is neither null nor of length 0.
    Note: this method returns true for a String that purely consists of whitespace.
    
    参数:
    
    str - the String to check (may be null)
    
    返回:
    
    true if the String is not null and has length
    
    另请参阅:
    
    hasLength(CharSequence), hasText(String)
  - hasText
```
public static boolean hasText(CharSequence str)
```
    Check whether the given CharSequence contains actual text.
    More specifically, this method returns true if the CharSequence is not null, its length is greater than 0, and it contains at least one non-whitespace character.
```
 StringUtils.hasText(null) = false
 StringUtils.hasText("") = false
 StringUtils.hasText(" ") = false
 StringUtils.hasText("12345") = true
 StringUtils.hasText(" 12345 ") = true
 
```
    参数:
    
    str - the CharSequence to check (may be null)
    
    返回:
    
    true if the CharSequence is not null, its length is greater than 0, and it does not contain whitespace only
    
    另请参阅:
    
    Character.isWhitespace(char)
  - hasText
```
public static boolean hasText(String str)
```
    Check whether the given String contains actual text.
    More specifically, this method returns true if the String is not null, its length is greater than 0, and it contains at least one non-whitespace character.
    
    参数:
    
    str - the String to check (may be null)
    
    返回:
    
    true if the String is not null, its length is greater than 0, and it does not contain whitespace only
    
    另请参阅:
    
    hasText(CharSequence)
  - containsWhitespace
```
public static boolean containsWhitespace(CharSequence str)
```
    Check whether the given CharSequence contains any whitespace characters.
    
    参数:
    
    str - the CharSequence to check (may be null)
    
    返回:
    
    true if the CharSequence is not empty and contains at least 1 whitespace character
    
    另请参阅:
    
    Character.isWhitespace(char)
  - containsWhitespace
```
public static boolean containsWhitespace(String str)
```
    Check whether the given String contains any whitespace characters.
    
    参数:
    
    str - the String to check (may be null)
    
    返回:
    
    true if the String is not empty and contains at least 1 whitespace character
    
    另请参阅:
    
    containsWhitespace(CharSequence)
  - trimWhitespace
```
public static String trimWhitespace(String str)
```
    Trim leading and trailing whitespace from the given String.
    
    参数:
    
    str - the String to check
    
    返回:
    
    the trimmed String
    
    另请参阅:
    
    Character.isWhitespace(char)
  - trimAllWhitespace
```
public static String trimAllWhitespace(String str)
```
    Trim all whitespace from the given String: leading, trailing, and in between characters.
    
    参数:
    
    str - the String to check
    
    返回:
    
    the trimmed String
    
    另请参阅:
    
    Character.isWhitespace(char)
  - trimLeadingWhitespace
```
public static String trimLeadingWhitespace(String str)
```
    Trim leading whitespace from the given String.
    
    参数:
    
    str - the String to check
    
    返回:
    
    the trimmed String
    
    另请参阅:
    
    Character.isWhitespace(char)
  - trimTrailingWhitespace
```
public static String trimTrailingWhitespace(String str)
```
    Trim trailing whitespace from the given String.
    
    参数:
    
    str - the String to check
    
    返回:
    
    the trimmed String
    
    另请参阅:
    
    Character.isWhitespace(char)
  - trimLeadingCharacter
```
public static String trimLeadingCharacter(String str,
                                          char leadingCharacter)
```
    Trim all occurrences of the supplied leading character from the given String.
    
    参数:
    
    str - the String to check
    
    leadingCharacter - the leading character to be trimmed
    
    返回:
    
    the trimmed String
  - trimTrailingCharacter
```
public static String trimTrailingCharacter(String str,
                                           char trailingCharacter)
```
    Trim all occurrences of the supplied trailing character from the given String.
    
    参数:
    
    str - the String to check
    
    trailingCharacter - the trailing character to be trimmed
    
    返回:
    
    the trimmed String
  - startsWithIgnoreCase
```
public static boolean startsWithIgnoreCase(String str,
                                           String prefix)
```
    Test if the given String starts with the specified prefix, ignoring upper/lower case.
    
    参数:
    
    str - the String to check
    
    prefix - the prefix to look for
    
    另请参阅:
    
    String.startsWith(java.lang.String, int)
  - endsWithIgnoreCase
```
public static boolean endsWithIgnoreCase(String str,
                                         String suffix)
```
    Test if the given String ends with the specified suffix, ignoring upper/lower case.
    
    参数:
    
    str - the String to check
    
    suffix - the suffix to look for
    
    另请参阅:
    
    String.endsWith(java.lang.String)
  - substringMatch
```
public static boolean substringMatch(CharSequence str,
                                     int index,
                                     CharSequence substring)
```
    Test whether the given string matches the given substring at the given index.
    
    参数:
    
    str - the original string (or StringBuilder)
    
    index - the index in the original string to start matching against
    
    substring - the substring to match at the given index
  - countOccurrencesOf
```
public static int countOccurrencesOf(String str,
                                     String sub)
```
    Count the occurrences of the substring sub in string str.
    
    参数:
    
    str - string to search in
    
    sub - string to search for
  - delete
```
public static String delete(String inString,
                            String pattern)
```
    Delete all occurrences of the given substring.
    
    参数:
    
    inString - the original String
    
    pattern - the pattern to delete all occurrences of
    
    返回:
    
    the resulting String
  - deleteAny
```
public static String deleteAny(String inString,
                               String charsToDelete)
```
    Delete any character in a given String.
    
    参数:
    
    inString - the original String
    
    charsToDelete - a set of characters to delete. E.g. "az\n" will delete 'a's, 'z's and new lines.
    
    返回:
    
    the resulting String
  - quoteIfString
```
public static Object quoteIfString(Object obj)
```
    Turn the given Object into a String with single quotes if it is a String; keeping the Object as-is else.
    
    参数:
    
    obj - the input Object (e.g. "myString")
    
    返回:
    
    the quoted String (e.g. "'myString'"), or the input object as-is if not a String
  - unqualify
```
public static String unqualify(String qualifiedName,
                               char separator)
```
    Unqualify a string qualified by a separator character. For example, "this:name:is:qualified" returns "qualified" if using a ':' separator.
    
    参数:
    
    qualifiedName - the qualified name
    
    separator - the separator
  - capitalize
```
public static String capitalize(String str)
```
    Capitalize a String, changing the first letter to upper case as per Character.toUpperCase(char). No other letters are changed.
    
    参数:
    
    str - the String to capitalize
    
    返回:
    
    the capitalized String
  - uncapitalize
```
public static String uncapitalize(String str)
```
    Uncapitalize a String, changing the first letter to lower case as per Character.toLowerCase(char). No other letters are changed.
    
    参数:
    
    str - the String to uncapitalize
    
    返回:
    
    the uncapitalized String
  - getFilename
```
public static String getFilename(String path)
```
    Extract the filename from the given Java resource path, e.g. "mypath/myfile.txt" -> "myfile.txt".
    
    参数:
    
    path - the file path (may be null)
    
    返回:
    
    the extracted filename, or null if none
  - getFilenameExtension
```
public static String getFilenameExtension(String path)
```
    Extract the filename extension from the given Java resource path, e.g. "mypath/myfile.txt" -> "txt".
    
    参数:
    
    path - the file path (may be null)
    
    返回:
    
    the extracted filename extension, or null if none
  - stripFilenameExtension
```
public static String stripFilenameExtension(String path)
```
    Strip the filename extension from the given Java resource path, e.g. "mypath/myfile.txt" -> "mypath/myfile".
    
    参数:
    
    path - the file path
    
    返回:
    
    the path with stripped filename extension
  - applyRelativePath
```
public static String applyRelativePath(String path,
                                       String relativePath)
```
    Apply the given relative path to the given Java resource path, assuming standard Java folder separation (i.e. "/" separators).
    
    参数:
    
    path - the path to start from (usually a full file path)
    
    relativePath - the relative path to apply (relative to the full file path above)
    
    返回:
    
    the full file path that results from applying the relative path
  - cleanPath
```
public static String cleanPath(String path)
```
    Normalize the path by suppressing sequences like "path/.." and inner simple dots.
    The result is convenient for path comparison. For other uses, notice that Windows separators ("\") are replaced by simple slashes.
    
    参数:
    
    path - the original path
    
    返回:
    
    the normalized path
  - pathEquals
```
public static boolean pathEquals(String path1,
                                 String path2)
```
    Compare two paths after normalization of them.
    
    参数:
    
    path1 - first path for comparison
    
    path2 - second path for comparison
    
    返回:
    
    whether the two paths are equivalent after normalization
  - uriDecode
```
public static String uriDecode(String source,
                               Charset charset)
```
    Decode the given encoded URI component value. Based on the following rules:
    - Alphanumeric characters "a" through "z", "A" through "Z", and "0" through "9" stay the same.
    - Special characters "-", "_", ".", and "*" stay the same.
    - A sequence "%<i>xy</i>" is interpreted as a hexadecimal representation of the character.
    参数:
    
    source - the encoded String
    
    charset - the character set
    
    返回:
    
    the decoded value
    
    抛出:
    
    IllegalArgumentException - when the given source contains invalid encoded sequences
    
    从以下版本开始:
    
    5.0
    
    另请参阅:
    
    URLDecoder.decode(String, String)
  - parseLocale
```
public static Locale parseLocale(String localeValue)
```
    Parse the given String value into a Locale, accepting the Locale.toString() format as well as BCP 47 language tags.
    
    参数:
    
    localeValue - the locale value: following either Locale's toString() format ("en", "en_UK", etc), also accepting spaces as separators (as an alternative to underscores), or BCP 47 (e.g. "en-UK") as specified by Locale.forLanguageTag(java.lang.String) on Java 7+
    
    返回:
    
    a corresponding Locale instance, or null if none
    
    抛出:
    
    IllegalArgumentException - in case of an invalid locale specification
    
    从以下版本开始:
    
    5.0.4
    
    另请参阅:
    
    parseLocaleString(java.lang.String), Locale.forLanguageTag(java.lang.String)
  - parseLocaleString
```
public static Locale parseLocaleString(String localeString)
```
    Parse the given String representation into a Locale.
    For many parsing scenarios, this is an inverse operation of Locale's toString, in a lenient sense. This method does not aim for strict Locale design compliance; it is rather specifically tailored for typical Spring parsing needs.
    Note: This delegate does not accept the BCP 47 language tag format. Please use parseLocale(java.lang.String) for lenient parsing of both formats.
    
    参数:
    
    localeString - the locale String: following Locale's toString() format ("en", "en_UK", etc), also accepting spaces as separators (as an alternative to underscores)
    
    返回:
    
    a corresponding Locale instance, or null if none
    
    抛出:
    
    IllegalArgumentException - in case of an invalid locale specification
  - toLanguageTag
```
@Deprecated
public static String toLanguageTag(Locale locale)
```
    已过时。 as of 5.0.4, in favor of Locale.toLanguageTag()
    
    Determine the RFC 3066 compliant language tag, as used for the HTTP "Accept-Language" header.
    
    参数:
    
    locale - the Locale to transform to a language tag
    
    返回:
    
    the RFC 3066 compliant language tag as String
  - parseTimeZoneString
```
public static TimeZone parseTimeZoneString(String timeZoneString)
```
    Parse the given timeZoneString value into a TimeZone.
    
    参数:
    
    timeZoneString - the time zone String, following TimeZone.getTimeZone(String) but throwing IllegalArgumentException in case of an invalid time zone specification
    
    返回:
    
    a corresponding TimeZone instance
    
    抛出:
    
    IllegalArgumentException - in case of an invalid time zone specification
  - addStringToArray
```
public static String[] addStringToArray(String[] array,
                                        String str)
```
    Append the given String to the given String array, returning a new array consisting of the input array contents plus the given String.
    
    参数:
    
    array - the array to append to (can be null)
    
    str - the String to append
    
    返回:
    
    the new array (never null)
  - concatenateStringArrays
```
public static String[] concatenateStringArrays(String[] array1,
                                               String[] array2)
```
    Concatenate the given String arrays into one, with overlapping array elements included twice.
    The order of elements in the original arrays is preserved.
    
    参数:
    
    array1 - the first array (can be null)
    
    array2 - the second array (can be null)
    
    返回:
    
    the new array (null if both given arrays were null)
  - mergeStringArrays
```
@Deprecated
public static String[] mergeStringArrays(String[] array1,
                                                      String[] array2)
```
    已过时。 as of 4.3.15, in favor of manual merging via LinkedHashSet (with every entry included at most once, even entries within the first array)
    
    Merge the given String arrays into one, with overlapping array elements only included once.
    The order of elements in the original arrays is preserved (with the exception of overlapping elements, which are only included on their first occurrence).
    
    参数:
    
    array1 - the first array (can be null)
    
    array2 - the second array (can be null)
    
    返回:
    
    the new array (null if both given arrays were null)
  - sortStringArray
```
public static String[] sortStringArray(String[] array)
```
    Turn given source String array into sorted array.
    
    参数:
    
    array - the source array
    
    返回:
    
    the sorted array (never null)
  - toStringArray
```
public static String[] toStringArray(Collection<String> collection)
```
    Copy the given Collection into a String array.
    The Collection must contain String elements only.
    
    参数:
    
    collection - the Collection to copy
    
    返回:
    
    the String array
  - toStringArray
```
public static String[] toStringArray(Enumeration<String> enumeration)
```
    Copy the given Enumeration into a String array. The Enumeration must contain String elements only.
    
    参数:
    
    enumeration - the Enumeration to copy
    
    返回:
    
    the String array
  - trimArrayElements
```
public static String[] trimArrayElements(String[] array)
```
    Trim the elements of the given String array, calling String.trim() on each of them.
    
    参数:
    
    array - the original String array (potentially empty)
    
    返回:
    
    the resulting array (of the same size) with trimmed elements
  - removeDuplicateStrings
```
public static String[] removeDuplicateStrings(String[] array)
```
    Remove duplicate strings from the given array.
    As of 4.2, it preserves the original order, as it uses a LinkedHashSet.
    
    参数:
    
    array - the String array (potentially empty)
    
    返回:
    
    an array without duplicates, in natural sort order
  - split
```
public static String[] split(String toSplit,
                             String delimiter)
```
    Split a String at the first occurrence of the delimiter. Does not include the delimiter in the result.
    
    参数:
    
    toSplit - the string to split (potentially null or empty)
    
    delimiter - to split the string up with (potentially null or empty)
    
    返回:
    
    a two element array with index 0 being before the delimiter, and index 1 being after the delimiter (neither element includes the delimiter); or null if the delimiter wasn't found in the given input String
  - splitArrayElementsIntoProperties
```
public static Properties splitArrayElementsIntoProperties(String[] array,
                                                          String delimiter)
```
    Take an array of strings and split each element based on the given delimiter. A Properties instance is then generated, with the left of the delimiter providing the key, and the right of the delimiter providing the value.
    Will trim both the key and value before adding them to the Properties.
    
    参数:
    
    array - the array to process
    
    delimiter - to split each element using (typically the equals symbol)
    
    返回:
    
    a Properties instance representing the array contents, or null if the array to process was null or empty
  - splitArrayElementsIntoProperties
```
public static Properties splitArrayElementsIntoProperties(String[] array,
                                                          String delimiter,
                                                          String charsToDelete)
```
    Take an array of strings and split each element based on the given delimiter. A Properties instance is then generated, with the left of the delimiter providing the key, and the right of the delimiter providing the value.
    Will trim both the key and value before adding them to the Properties instance.
    
    参数:
    
    array - the array to process
    
    delimiter - to split each element using (typically the equals symbol)
    
    charsToDelete - one or more characters to remove from each element prior to attempting the split operation (typically the quotation mark symbol), or null if no removal should occur
    
    返回:
    
    a Properties instance representing the array contents, or null if the array to process was null or empty
  - tokenizeToStringArray
```
public static String[] tokenizeToStringArray(String str,
                                             String delimiters)
```
    Tokenize the given String into a String array via a StringTokenizer.
    Trims tokens and omits empty tokens.
    The given delimiters string can consist of any number of delimiter characters. Each of those characters can be used to separate tokens. A delimiter is always a single character; for multi-character delimiters, consider using delimitedListToStringArray(java.lang.String, java.lang.String).
    
    参数:
    
    str - the String to tokenize (potentially null or empty)
    
    delimiters - the delimiter characters, assembled as a String (each of the characters is individually considered as a delimiter)
    
    返回:
    
    an array of the tokens
    
    另请参阅:
    
    StringTokenizer, String.trim(), delimitedListToStringArray(java.lang.String, java.lang.String)
  - tokenizeToStringArray
```
public static String[] tokenizeToStringArray(String str,
                                             String delimiters,
                                             boolean trimTokens,
                                             boolean ignoreEmptyTokens)
```
    Tokenize the given String into a String array via a StringTokenizer.
    The given delimiters string can consist of any number of delimiter characters. Each of those characters can be used to separate tokens. A delimiter is always a single character; for multi-character delimiters, consider using delimitedListToStringArray(java.lang.String, java.lang.String).
    
    参数:
    
    str - the String to tokenize (potentially null or empty)
    
    delimiters - the delimiter characters, assembled as a String (each of the characters is individually considered as a delimiter)
    
    trimTokens - trim the tokens via String.trim()
    
    ignoreEmptyTokens - omit empty tokens from the result array (only applies to tokens that are empty after trimming; StringTokenizer will not consider subsequent delimiters as token in the first place).
    
    返回:
    
    an array of the tokens
    
    另请参阅:
    
    StringTokenizer, String.trim(), delimitedListToStringArray(java.lang.String, java.lang.String)
  - delimitedListToStringArray
```
public static String[] delimitedListToStringArray(String str,
                                                  String delimiter)
```
    Take a String that is a delimited list and convert it into a String array.
    A single delimiter may consist of more than one character, but it will still be considered as a single delimiter string, rather than as bunch of potential delimiter characters, in contrast to tokenizeToStringArray(java.lang.String, java.lang.String).
    
    参数:
    
    str - the input String (potentially null or empty)
    
    delimiter - the delimiter between elements (this is a single delimiter, rather than a bunch individual delimiter characters)
    
    返回:
    
    an array of the tokens in the list
    
    另请参阅:
    
    tokenizeToStringArray(java.lang.String, java.lang.String)
  - delimitedListToStringArray
```
public static String[] delimitedListToStringArray(String str,
                                                  String delimiter,
                                                  String charsToDelete)
```
    Take a String that is a delimited list and convert it into a String array.
    A single delimiter may consist of more than one character, but it will still be considered as a single delimiter string, rather than as bunch of potential delimiter characters, in contrast to tokenizeToStringArray(java.lang.String, java.lang.String).
    
    参数:
    
    str - the input String (potentially null or empty)
    
    delimiter - the delimiter between elements (this is a single delimiter, rather than a bunch individual delimiter characters)
    
    charsToDelete - a set of characters to delete; useful for deleting unwanted line breaks: e.g. "\r\n\f" will delete all new lines and line feeds in a String
    
    返回:
    
    an array of the tokens in the list
    
    另请参阅:
    
    tokenizeToStringArray(java.lang.String, java.lang.String)
  - commaDelimitedListToStringArray
```
public static String[] commaDelimitedListToStringArray(String str)
```
    Convert a comma delimited list (e.g., a row from a CSV file) into an array of strings.
    
    参数:
    
    str - the input String (potentially null or empty)
    
    返回:
    
    an array of strings, or the empty array in case of empty input
  - commaDelimitedListToSet
```
public static Set<String> commaDelimitedListToSet(String str)
```
    Convert a comma delimited list (e.g., a row from a CSV file) into a set.
    Note that this will suppress duplicates, and as of 4.2, the elements in the returned set will preserve the original order in a LinkedHashSet.
    
    参数:
    
    str - the input String (potentially null or empty)
    
    返回:
    
    a set of String entries in the list
    
    另请参阅:
    
    removeDuplicateStrings(String[])
  - collectionToDelimitedString
```
public static String collectionToDelimitedString(Collection<?> coll,
                                                 String delim,
                                                 String prefix,
                                                 String suffix)
```
    Convert a Collection to a delimited String (e.g. CSV).
    Useful for toString() implementations.
    
    参数:
    
    coll - the Collection to convert (potentially null or empty)
    
    delim - the delimiter to use (typically a ",")
    
    prefix - the String to start each element with
    
    suffix - the String to end each element with
    
    返回:
    
    the delimited String
  - collectionToDelimitedString
```
public static String collectionToDelimitedString(Collection<?> coll,
                                                 String delim)
```
    Convert a Collection into a delimited String (e.g. CSV).
    Useful for toString() implementations.
    
    参数:
    
    coll - the Collection to convert (potentially null or empty)
    
    delim - the delimiter to use (typically a ",")
    
    返回:
    
    the delimited String
  - collectionToCommaDelimitedString
```
public static String collectionToCommaDelimitedString(Collection<?> coll)
```
    Convert a Collection into a delimited String (e.g., CSV).
    Useful for toString() implementations.
    
    参数:
    
    coll - the Collection to convert (potentially null or empty)
    
    返回:
    
    the delimited String
  - arrayToDelimitedString
```
public static String arrayToDelimitedString(Object[] arr,
                                            String delim)
```
    Convert a String array into a delimited String (e.g. CSV).
    Useful for toString() implementations.
    
    参数:
    
    arr - the array to display (potentially null or empty)
    
    delim - the delimiter to use (typically a ",")
    
    返回:
    
    the delimited String
  - arrayToCommaDelimitedString
```
public static String arrayToCommaDelimitedString(Object[] arr)
```
    Convert a String array into a comma delimited String (i.e., CSV).
    Useful for toString() implementations.
    
    参数:
    
    arr - the array to display (potentially null or empty)
    
    返回:
    
    the delimited String

类 StringUtils

嵌套类概要

字段概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

INDEX_NOT_FOUND

EMPTY_ARRAY

BYTES_NEW_LINE

WHITESPACE

EMPTY_STRINGS

BATCH_ID_PLACEHOLDER

方法详细资料

lastIndexOfLetter

join

joinWithQualifierAndSuffix

join

join

add

repeat

repeat

repeat

replace

replace

replace

replace

replace

getLastNonWhitespaceCharacter

getFirstNonWhitespaceCharacter

replaceOnce

split

splitTrimmingTokens

unqualify

qualifier

collapse

collapseQualifier

partiallyUnqualify

collapseQualifierBase

suffix

root

unroot

booleanValue

toString

multiply

countUnquoted

locateUnquoted

isNotEmpty

isEmpty

isEmptyOrWhiteSpace

qualify

qualifyConditionally

qualify

qualifyIfNot

firstIndexOfChar

firstIndexOfChar

truncate

generateAlias

generateAlias

unqualifyEntityName

moveAndToBeginning

isQuoted

quote

unquote

toArrayElement

nullIfEmpty

parseCommaSeparatedString

join

join

convertByStyle

camelhumpToUnderline

underlineToCamelhump

isUppercaseAlpha

isLowercaseAlpha

toUpperAscii

toLowerAscii

indexOf

indexOf

lastIndexOf

lastIndexOf

lastIndexOf