set

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import java.util.*;

 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);