package com.test;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

public class Array_list {
    public static void main(String[] args) {
        Set<String> a = new HashSet<String>();
        Set<String> b = new HashSet<String>();
 

        HashSet<String> hashSetUnion = new HashSet<String>();
        Set<String> sameSet = new HashSet<String>();
        a.add("a");
        a.add("b");
        a.add("c");
        b.add("c");
        b.add("d");
        System.out.println("------------求兩個集合的並集---------------"
 
);
        hashSetUnion.addAll(a);
        hashSetUnion.addAll(b);
        System.out.println(hashSetUnion.toString());
        System.out.println("--------------求兩個集合的交集-------------");
        for (String string : a) {
            if(b.contains(string)){
                sameSet.add(string);
            }
        }
        System.out
 
.println(sameSet.toString());
    }
}