cn.tenmg.sqltool.utils

类 CollectionUtils

java.lang.Object

cn.tenmg.sqltool.utils.CollectionUtils

public abstract class CollectionUtils
extends Object

集合工具类

作者:

赵伟均 wjzhao@aliyun.com

构造器概要

构造器

构造器和说明
CollectionUtils()

方法概要

限定符和类型	方法和说明
static <E> List<E>	asList(E... elements)
static <E> Set<E>	asSet(E... elements)
static boolean	isEmpty(Collection<?> c) Returns true if the specified Collection is null or empty, false otherwise.
static boolean	isEmpty(Map<?,?> m) Returns true if the specified Map is null or empty, false otherwise.
static int	size(Collection<?> c) Returns the size of the specified collection or 0 if the collection is null.
static int	size(Map<?,?> m) Returns the size of the specified map or 0 if the map is null.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

CollectionUtils

public CollectionUtils()

方法详细资料

asSet

@SafeVarargs
public static <E> Set<E> asSet(E... elements)

isEmpty

public static boolean isEmpty(Collection<?> c)

Returns true if the specified Collection is null or empty, false otherwise.

参数:

c - the collection to check

返回:

true if the specified Collection is null or empty, false otherwise.

从以下版本开始:

1.0

isEmpty

public static boolean isEmpty(Map<?,?> m)

Returns true if the specified Map is null or empty, false otherwise.

参数:

m - the Map to check

返回:

true if the specified Map is null or empty, false otherwise.

size

public static int size(Collection<?> c)

Returns the size of the specified collection or 0 if the collection is null.

参数:

c - the collection to check

返回:

the size of the specified collection or 0 if the collection is null.

size

public static int size(Map<?,?> m)

Returns the size of the specified map or 0 if the map is null.

参数:

m - the map to check

返回:

the size of the specified map or 0 if the map is null.

asList

@SafeVarargs
public static <E> List<E> asList(E... elements)