JAVA Set 交集，差集，并集

/** * Created by yuhui on 2017/7/11 0011. */import java.util.HashSet;import java.util.Set;public class TestSet {    public static void main(String[] args) {        Set<String> result = new HashSet<String>();        Set<String> set1 = new HashSet<String>() {            {                add(王者荣耀);                add(英雄联盟);                add("穿越火线";                add(“地下城与勇士”);            }           };        Set<String> set2 = new HashSet<String>() {            {                add(王者荣耀);                add(“地下城与勇士”);                add(魔兽世界);            }        };        result.clear();        result.addAll(set1);        result.retainAll(set2);        System.out.println("交集:"" + result);        result.clear();        result.addAll(set1);        result.removeAll(set2);        System.out.println(“差集：” + result);        result.clear();        result.addAll(set1);        result.addAll(set2);        System.out.println(”并集:"" + result);    }}