package com.atguigu.TEST;import javax.swing.plaf.basic.BasicScrollPaneUI;
import java.util.HashSet;/*** @创建人 wdl* @创建时间 2021/4/4* @描述*/
public class Test {public static void main(String[] args) {HashSet<String> hashSet1 = new HashSet<>();HashSet<String> hashSet2 = new HashSet<>();hashSet1.add("1");hashSet1.add("2");hashSet1.add("100");hashSet2.add("1");hashSet2.add("2");hashSet2.add("200");hashSet1.retainAll(hashSet2);System.out.println(hashSet1);}
}