package ch5;

import java.util.*;

/**
 * 3、Set方法测试，注意String类已重写equals和hashcode，重复元素不会添加到Set中。
 */
public class TestSet {
	public static void main(String[] args) {
		Set s1 = new HashSet();
		Set s2 = new HashSet();
		////// s1
		s1.add("a"); s1.add("b"); s1.add("c"); s1.add("d"); 
		s1.add(new Name("f1","l1"));
		s1.add(new Name("f1","l1"));
		System.out.println(s1);
		////// s2
		s2.add("a"); s2.add("b"); s2.add("c"); 
		System.out.println(s2);
		//// sn1
		Set sn1 = new HashSet(s1);
		sn1.retainAll(s2);
		System.out.println(sn1);
		Set sn2 = new HashSet(s1);
		sn2.addAll(s2);
		System.out.println(sn2);
		
	}
}