java 8两个List集合取交集、并集、差集、去重并集

public class ListTest {
 
    public static void main(String[] args) {
 
        ArrayList listA =  Arrays.asLis(t("a", "b", "c", "d", "e").toString().split(","));
        ArrayList listB =  Arrays.asLis(t( "b", "c", "d", "e", "f").toString().split(","));
        System.out.println("listA = " + listA);
        System.out.println("listB = " + listB);
        
        // listA和listB的差集（listA - listB）
        List 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 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 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 distinctList = listA.stream().distinct().collect(Collectors.toList());
        System.out.println("listA和listB去重并集 = " + distinctList);
    }
}