io.seata.common.util

类 CollectionUtils

java.lang.Object

io.seata.common.util.CollectionUtils

public class CollectionUtils
extends Object

The type Collection utils.

方法概要

限定符和类型	方法和说明
static <K,V> V	computeIfAbsent(Map<K,V> map, K key, Function<? super K,? extends V> mappingFunction) Compute if absent.
static Map<String,String>	decodeMap(String data) Decode string to map
static String	encodeMap(Map<String,String> map) Encode map to string
static <T> T	getLast(List<T> list) Get the last item.
static boolean	isEmpty(Collection<?> col) Is empty boolean.
static boolean	isEmpty(Map<?,?> map) Is empty boolean.
static boolean	isEmpty(Object[] array) Is empty boolean.
static boolean	isNotEmpty(Collection<?> col) Is not empty boolean.
static boolean	isNotEmpty(Map<?,?> map) Is not empty boolean.
static boolean	isNotEmpty(Object[] array) Is not empty boolean.
static boolean	isSizeEquals(Collection<?> col0, Collection<?> col1) Is size equals boolean.
static String	toString(Collection<?> col) Collection To string.
static String	toString(Map<?,?> map) Map to string.
static Map<String,String>	toStringMap(Map<String,Object> param) To string map
static List<String>	toUpperList(List<String> sourceList) To upper list.

从类继承的方法 java.lang.Object

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

方法详细资料

isEmpty

public static boolean isEmpty(Collection<?> col)

Is empty boolean.

参数:

col - the col

返回:

the boolean

isNotEmpty

public static boolean isNotEmpty(Collection<?> col)

Is not empty boolean.

参数:

col - the col

返回:

the boolean

isEmpty

public static boolean isEmpty(Object[] array)

Is empty boolean.

参数:

array - the array

返回:

the boolean

isNotEmpty

public static boolean isNotEmpty(Object[] array)

Is not empty boolean.

参数:

array - the array

返回:

the boolean

isEmpty

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

Is empty boolean.

参数:

map - the map

返回:

the boolean

isNotEmpty

public static boolean isNotEmpty(Map<?,?> map)

Is not empty boolean.

参数:

map - the map

返回:

the boolean

toString

public static String toString(Collection<?> col)

Collection To string.

参数:

col - the col

返回:

the string

toString

public static String toString(Map<?,?> map)

Map to string.

参数:

map - the map

返回:

the string

toStringMap

public static Map<String,String> toStringMap(Map<String,Object> param)

To string map

参数:

param - map

返回:

the string map

isSizeEquals

public static boolean isSizeEquals(Collection<?> col0,
                                   Collection<?> col1)

Is size equals boolean.

参数:

col0 - the col 0

col1 - the col 1

返回:

the boolean

encodeMap

public static String encodeMap(Map<String,String> map)

Encode map to string

参数:

map - origin map

返回:

String string

decodeMap

public static Map<String,String> decodeMap(String data)

Decode string to map

参数:

data - data

返回:

map map

computeIfAbsent

public static <K,V> V computeIfAbsent(Map<K,V> map,
                                      K key,
                                      Function<? super K,? extends V> mappingFunction)

Compute if absent. Use this method if you are frequently using the same key, because the get method has no lock.

类型参数:

K - the type of key

V - the type of value

参数:

map - the map

key - the key

mappingFunction - the mapping function

返回:

the value

toUpperList

public static List<String> toUpperList(List<String> sourceList)

To upper list.

参数:

sourceList - the source list

返回:

the list

getLast

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

Get the last item.

'IndexOutOfBoundsException' may be thrown, because the `list.size()` and `list.get(size - 1)` are not atomic. This method can avoid the 'IndexOutOfBoundsException' cause by concurrency.

类型参数:

T - the type of item

参数:

list - the list

返回:

the last item