testset.java

疯狂Java讲义_源码(含Java设计模式CHM

import java.util.*;

/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */

public class TestSet
{
	public static void main(String[] args) 
	{
		Set books = new HashSet();
		//添加一个字符串对象
		books.add(new String("Struts2权威指南"));
		//再次添加一个字符串对象，
		//因为两个字符串对象通过equals方法比较相等，所以添加失败，返回false
		boolean result = books.add(new String("Struts2权威指南"));
		System.out.println(result);
		//下面输出看到集合只有一个元素
		System.out.println(books);	
	}
}