/**

 * 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);

    }

}