org.openingo.jdkits.collection

Class ListKit

java.lang.Object

org.openingo.jdkits.collection.ListKit

public final class ListKit
extends Object

List Kit

Author:

Qicz

Method Summary

Modifier and Type	Method and Description
static <T> boolean	addAll(List<T> list, Collection<T> collection) Rewrite List.addAll(Collection), check the specified collection
static <T> boolean	addAll(List<T> list, int index, Collection<T> collection) Rewrite List.addAll(int, Collection), check the specified collection
static <T> List<T>	defaultIfNull(List<T> list, List<T> defaultList) if the list is null or empty, return a default list
static <T> List<T>	emptyArrayList() 返回一个空的ArrayList
static <T> List<T>	emptyArrayList(int initialCapacity) Constructs an empty list with the specified initial capacity.
static <T> List<T>	emptyArrayListIfNull(List<T> list) 如果list 为null 返回一个emptyArrayList
static <T> List<T>	emptyIfNull(List<T> list) 如果list 为null 返回一个emptyList
static <T> List<T>	emptyList() 返回一个空的List
static <T> OverrideList<T>	emptyOverrideList() 返回一个空的OverrideList
static <T> OverrideList<T>	emptyOverrideList(int initialCapacity)
static <T> boolean	hasManyElement(List<T> list) 判断list是否只有一个元素
static <T> boolean	hasOneElement(List<T> list) 判断list是否只有一个元素
static <T> List<T>	intersect(List<T> list1, List<T> list2) List1 intersect List2 交集
static <T> boolean	isNull(List<T> list) validate list is Null or not Null
static <T> List<T>	minus(List<T> list1, List<T> list2) List1 minus List2 差集
static void	permutation(List<String> permutationRet, List<List<Object>> list, String prefix, String split) 递归的方式计算排列组合
static <T> boolean	removeAll(List<T> list, Collection<T> removingList) 从list移除包含在removingList中元素
static <T> void	replace(List<T> list, int index, T obj) replace一个索引对应的元素
static <T> List<T>	reverse(List<T> list) 翻转一个List
static <T> List<T>	synchronizedList(List<T> list) Synchronized List
static <T> T[]	toArray(List<T> list) list转化为Array
static <T> List<T>	union(List<T> list1, List<T> list2) List1 union List2 合集

Methods inherited from class java.lang.Object

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

Method Detail

emptyOverrideList

public static <T> OverrideList<T> emptyOverrideList()

返回一个空的OverrideList

emptyOverrideList

public static <T> OverrideList<T> emptyOverrideList(int initialCapacity)

emptyArrayList

public static <T> List<T> emptyArrayList()

返回一个空的ArrayList

emptyArrayList

public static <T> List<T> emptyArrayList(int initialCapacity)

Constructs an empty list with the specified initial capacity.

Parameters:

initialCapacity - the initial capacity of the list

emptyList

public static <T> List<T> emptyList()

返回一个空的List

emptyIfNull

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

如果list 为null 返回一个emptyList

Type Parameters:

T -

Parameters:

list -

Returns:

emptyArrayListIfNull

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

如果list 为null 返回一个emptyArrayList

Type Parameters:

T -

Parameters:

list -

Returns:

defaultIfNull

public static <T> List<T> defaultIfNull(List<T> list,
                                        List<T> defaultList)

if the list is null or empty, return a default list

Type Parameters:

T -

Parameters:

list -

defaultList -

Returns:

list or default list when list is null or empty.

permutation

public static void permutation(List<String> permutationRet,
                               List<List<Object>> list,
                               String prefix,
                               String split)

递归的方式计算排列组合

Parameters:

permutationRet - 组合结果

list - 传入list.size()个集合

prefix - 上一步递归中生成的排列组合

toArray

public static <T> T[] toArray(List<T> list)

list转化为Array

Type Parameters:

T -

Parameters:

list -

union

public static <T> List<T> union(List<T> list1,
                                List<T> list2)

List1 union List2 合集

Parameters:

list1 -

list2 -

intersect

public static <T> List<T> intersect(List<T> list1,
                                    List<T> list2)

List1 intersect List2 交集

Parameters:

list1 -

list2 -

minus

public static <T> List<T> minus(List<T> list1,
                                List<T> list2)

List1 minus List2 差集

Parameters:

list1 -

list2 -

reverse

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

翻转一个List

Parameters:

list -

removeAll

public static <T> boolean removeAll(List<T> list,
                                    Collection<T> removingList)

从list移除包含在removingList中元素

Type Parameters:

T -

Parameters:

list -

removingList -

Returns:

list移除removingList中元素后剩余的元素集合

synchronizedList

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

Synchronized List

Type Parameters:

T -

Parameters:

list -

isNull

public static <T> boolean isNull(List<T> list)

validate list is Null or not Null

Type Parameters:

T -

Parameters:

list -

Returns:

true if this list is Null.

hasOneElement

public static <T> boolean hasOneElement(List<T> list)

判断list是否只有一个元素

Type Parameters:

T -

Parameters:

list -

Returns:

true只有一个元素，false多个元素或list为空

hasManyElement

public static <T> boolean hasManyElement(List<T> list)

判断list是否只有一个元素

Type Parameters:

T -

Parameters:

list -

Returns:

true只有一个元素，false多个元素或list为空

replace

public static <T> void replace(List<T> list,
                               int index,
                               T obj)

replace一个索引对应的元素

Type Parameters:

T -

Parameters:

list -

index -

obj -

addAll

public static <T> boolean addAll(List<T> list,
                                 Collection<T> collection)

Rewrite List.addAll(Collection), check the specified collection

Type Parameters:

T -

Parameters:

list -

collection -

Returns:

true if this list changed as a result of the call

addAll

public static <T> boolean addAll(List<T> list,
                                 int index,
                                 Collection<T> collection)

Rewrite List.addAll(int, Collection), check the specified collection

Type Parameters:

T -

Parameters:

list -

index -

collection -

Returns:

true if this list changed as a result of the call