org.ttzero.excel.util

类 StringUtil

java.lang.Object

org.ttzero.excel.util.StringUtil

public class StringUtil
extends Object

string util

作者:

guanquan.wang on 2017/9/30.

字段概要

字段

限定符和类型	字段和说明
static String	EMPTY Const `""` string

方法概要

限定符和类型	方法和说明
static String	formatBinarySize(long size) long size to string
static int	indexOf(String[] array, String v) Returns the index within this string array of the first occurrence of the specified string.
static int	indexOf(String str, int ch, int fromIndex, int toIndex) Returns the index within this string of the first occurrence of the specified character, starting the search at the specified range.
static boolean	isBlank(CharSequence cs) Checks if a CharSequence is empty (""), null or whitespace only.
static boolean	isEmpty(String s) Returns true if it is null or String.length() is 0.
static boolean	isNotBlank(CharSequence cs) Checks if a CharSequence is not empty (""), not null and not whitespace only.
static boolean	isNotEmpty(String s) Returns true if, and only if, String.length() greater than 0.
static String	lowFirstKey(String key) Turn the first character into an lower case.
static void	swap(String[] values, int a, int b) Wrap value in string array
static String	timeToString(long t) Time millis to String, like 1h:3s or 4m:1s
static String	toPascalCase(String name) Convert to camel case string.
static String	uppFirstKey(String key) Turn the first character into an upper case.

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

EMPTY

public static final String EMPTY

Const `""` string

另请参阅:

常量字段值

方法详细资料

isEmpty

public static boolean isEmpty(String s)

Returns true if it is null or String.length() is 0.

参数:

s - string value to check

返回:

true if null or String.length() is 0, otherwise false

isNotEmpty

public static boolean isNotEmpty(String s)

Returns true if, and only if, String.length() greater than 0.

参数:

s - string value to check

返回:

true if String.length() greater than 0, otherwise false

indexOf

public static int indexOf(String[] array,
                          String v)

Returns the index within this string array of the first occurrence of the specified string.

If no such string occurs in this array, then -1 is returned.

参数:

array - array to search

v - the specify string

返回:

the index of the first occurrence of the string in array, or -1 if the string does not occur.

uppFirstKey

public static String uppFirstKey(String key)

Turn the first character into an upper case. It means if the first character is between 97 and 122, it will be minus 32.

参数:

key - a string to processor

返回:

a string witch the first character is upper case

lowFirstKey

public static String lowFirstKey(String key)

Turn the first character into an lower case. It means if the first character is between 65 and 90, it will be plus 32.

参数:

key - a string to processor

返回:

a string witch the first character is lower case

toPascalCase

public static String toPascalCase(String name)

Convert to camel case string.

参数:

name - a string to processor

返回:

a camel case string

swap

public static void swap(String[] values,
                        int a,
                        int b)

Wrap value in string array

参数:

values - the array to warp

a - from index

b - to index

isBlank

public static boolean isBlank(CharSequence cs)

Checks if a CharSequence is empty (""), null or whitespace only.

参数:

cs - the CharSequence to check, may be null

返回:

true if the CharSequence is null, empty or whitespace only

isNotBlank

public static boolean isNotBlank(CharSequence cs)

Checks if a CharSequence is not empty (""), not null and not whitespace only.

参数:

cs - the CharSequence to check, may be null

返回:

true if the CharSequence is not empty and not null and not whitespace only

formatBinarySize

public static String formatBinarySize(long size)

long size to string

参数:

size - file size in bytes

返回:

String size

timeToString

public static String timeToString(long t)

Time millis to String, like 1h:3s or 4m:1s

参数:

t - time millis

返回:

string

indexOf

public static int indexOf(String str,
                          int ch,
                          int fromIndex,
                          int toIndex)

Returns the index within this string of the first occurrence of the specified character, starting the search at the specified range.

If a character with value ch occurs in the character sequence represented by this String object at an index no smaller than fromIndex, then the index of the first such occurrence is returned. For values of ch in the range from 0 to 0xFFFF (inclusive), this is the smallest value k such that:

 (this.charAt(k) == ch)  && (k >= fromIndex)
 

is true. For other values of ch, it is the smallest value k such that:

 (this.codePointAt(k) == ch)  && (k >= fromIndex)
 

is true. In either case, if no such character occurs in this string at or after position fromIndex, then -1 is returned.

There is no restriction on the value of fromIndex. If it is negative, it has the same effect as if it were zero: this entire string may be searched. If it is greater than the length of this string, it has the same effect as if it were equal to the length of this string: -1 is returned.

All indices are specified in char values (Unicode code units).

参数:

str - not null

ch - a character (Unicode code point).

fromIndex - the index to start the search from.

toIndex - the high endpoint (exclusive) of the search end.

返回:

the index of the first occurrence of the character in the character sequence represented by this object that is greater than or equal to fromIndex, or -1 if the character does not occur.