java中set的交集、差集、并集的简单实现

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);
}
}