org.tio.utils.hutool

Class CollUtil

java.lang.Object

org.tio.utils.hutool.CollUtil

public class CollUtil
extends Object

Author:

tanyaowu 2019年10月5日 下午1:08:58

Method Summary

Modifier and Type	Method and Description
static <K,V> V	computeIfAbsent(Map<K,V> map, K key, Function<K,V> mappingFunction) A temporary workaround for Java 8 specific performance issue JDK-8161372 .
static boolean	isEmpty(Collection<?> collection) 集合是否为空
static boolean	isNotEmpty(Collection<?> collection) 集合是否为非空
static <T> List<List<T>>	partition(List<T> list, int size) list 分片

Methods inherited from class java.lang.Object

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

Method Detail

isEmpty

public static boolean isEmpty(Collection<?> collection)

集合是否为空

Parameters:

collection - 集合

Returns:

是否为空

isNotEmpty

public static boolean isNotEmpty(Collection<?> collection)

集合是否为非空

Parameters:

collection - 集合

Returns:

是否为非空

computeIfAbsent

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

A temporary workaround for Java 8 specific performance issue JDK-8161372 .
This class should be removed once we drop Java 8 support.

Type Parameters:

K - 泛型

V - 泛型

Parameters:

map - map

key - key

mappingFunction - Function

Returns:

v

See Also:

https://bugs.openjdk.java.net/browse/JDK-8161372

partition

public static <T> List<List<T>> partition(List<T> list,
                                          int size)

list 分片

Type Parameters:

T - 泛型

Parameters:

list - List

size - 分片大小

Returns:

List 分片