用java求“交、叉、并集”

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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);             } }