【Java用法】java 8两个List集合取交集、并集、差集、去重并集

在业务的开发过程中会经常用到两个List集合相互取值的情况，于是记录在此，方便后续使用哦~~~

public class ListTest {public static void main(String[] args) {ArrayList<String> listA = CollectionUtil.toList("a", "b", "c", "d", "e");ArrayList<String> listB = CollectionUtil.toList( "b", "c", "d", "e", "f");System.out.println("listA = " + listA);System.out.println("listB = " + listB);// listA和listB的差集（listA - listB）List<String> collect = listA.stream().filter(item -> !listB.contains(item)).collect(Collectors.toList());System.out.println("listA - listB的差集 = " + collect);// listA和listB的差集（listB - listA）List<String> collect1 = listB.stream().filter(item -> !listA.contains(item)).collect(Collectors.toList());System.out.println("listB - listA的差集 = " + collect1);// listA和listB交集List<String> intersection = listA.stream().filter(listB::contains).collect(Collectors.toList());System.out.println("listA和listB交集 = " + intersection);// listA和listB并集（不去重）listA.addAll(listB);System.out.println("listA和listB并集 = " + listA);// listA和listB并集（去重）List<String> distinctList = listA.stream().distinct().collect(Collectors.toList());System.out.println("listA和listB去重并集 = " + distinctList);}}

运行结果为：

完结！