javaSet集合的并集、差集、交集

package test;import java.util.HashSet;import java.util.Set;public class Test {    public static void main(String[] args) {        Set<Integer> result = new HashSet<Integer>();        Set<Integer> set1 = new HashSet<Integer>(){{            add(1);            add(3);            add(5);        }};        Set<Integer> set2 = new HashSet<Integer>(){{            add(1);            add(2);            add(3);        }};        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);    }}