程序包 org.apache.dubbo.common.utils

类 CollectionUtils

java.lang.Object

org.apache.dubbo.common.utils.CollectionUtils

public class CollectionUtils
extends Object

Miscellaneous collection utility methods. Mainly for internal use within the framework.

从以下版本开始:

2.0.7

作者:

william.liangf

方法概要

修饰符和类型	方法	说明
static <T> int	addAll(Collection<T> collection, T... values)	Add the multiple values into the specified collection
static boolean	equals(Collection<?> one, Collection<?> another)	Compares the specified collection with another, the main implementation references AbstractSet
static <T> T	first(Collection<T> values)	Take the first element from the specified collection
static boolean	isEmpty(Collection<?> collection)	Return true if the supplied Collection is null or empty.
static boolean	isEmptyMap(Map map)	Return true if the supplied Map is null or empty.
static boolean	isNotEmpty(Collection<?> collection)	Return true if the supplied Collection is not null or not empty.
static boolean	isNotEmptyMap(Map map)	Return true if the supplied Map is not null or not empty.
static String	join(List<String> list, String separator)
static List<String>	join(Map<String,String> map, String separator)
static Map<String,List<String>>	joinAll(Map<String,Map<String,String>> map, String separator)
static boolean	mapEquals(Map<?,?> map1, Map<?,?> map2)
static <T> Set<T>	ofSet(T... values)	Convert to multiple values to be LinkedHashSet
static int	size(Collection<?> collection)	Get the size of the specified Collection
static <T> List<T>	sort(List<T> list)
static List<String>	sortSimpleName(List<String> list)
static Map<String,String>	split(List<String> list, String separator)
static Map<String,Map<String,String>>	splitAll(Map<String,List<String>> list, String separator)
static <K,V> Map<K,V>	toMap(Object... pairs)
static Map<String,String>	toStringMap(String... pairs)

从类继承的方法 java.lang.Object

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

方法详细资料

sort

public static <T> List<T> sort(List<T> list)

sortSimpleName

public static List<String> sortSimpleName(List<String> list)

splitAll

public static Map<String,Map<String,String>> splitAll(Map<String,List<String>> list,
                                                                  String separator)

joinAll

public static Map<String,List<String>> joinAll(Map<String,Map<String,String>> map,
                                                     String separator)

split

public static Map<String,String> split(List<String> list,
                                             String separator)

join

public static List<String> join(Map<String,String> map,
                                String separator)

join

public static String join(List<String> list,
                          String separator)

mapEquals

public static boolean mapEquals(Map<?,?> map1,
                                Map<?,?> map2)

toStringMap

public static Map<String,String> toStringMap(String... pairs)

toMap

public static <K,V> Map<K,V> toMap(Object... pairs)

isEmpty

public static boolean isEmpty(Collection<?> collection)

Return true if the supplied Collection is null or empty. Otherwise, return false.

参数:

collection - the Collection to check

返回:

whether the given Collection is empty

isNotEmpty

public static boolean isNotEmpty(Collection<?> collection)

Return true if the supplied Collection is not null or not empty. Otherwise, return false.

参数:

collection - the Collection to check

返回:

whether the given Collection is not empty

isEmptyMap

public static boolean isEmptyMap(Map map)

Return true if the supplied Map is null or empty. Otherwise, return false.

参数:

map - the Map to check

返回:

whether the given Map is empty

isNotEmptyMap

public static boolean isNotEmptyMap(Map map)

Return true if the supplied Map is not null or not empty. Otherwise, return false.

参数:

map - the Map to check

返回:

whether the given Map is not empty

ofSet

public static <T> Set<T> ofSet(T... values)

Convert to multiple values to be LinkedHashSet

类型参数:

T - the type of values

参数:

values - one or more values

返回:

read-only Set

size

public static int size(Collection<?> collection)

Get the size of the specified Collection

参数:

collection - the specified Collection

返回:

must be positive number

从以下版本开始:

2.7.6

equals

public static boolean equals(Collection<?> one,
                             Collection<?> another)

Compares the specified collection with another, the main implementation references AbstractSet

参数:

one - Collection

another - Collection

返回:

if equals, return true, or false

从以下版本开始:

2.7.6

addAll

public static <T> int addAll(Collection<T> collection,
                             T... values)

Add the multiple values into the specified collection

类型参数:

T - the type of values

参数:

collection - the specified collection

values - the multiple values

返回:

the effected count after added

从以下版本开始:

2.7.6

first

public static <T> T first(Collection<T> values)

Take the first element from the specified collection

类型参数:

T - the type of element of collection

参数:

values - the collection object

返回:

if found, return the first one, or null

从以下版本开始:

2.7.6