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import java.util.*;

/**

* Description:

* <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>

* <br/>Copyright (C), 2001-2012, Yeeku.H.Lee

* <br/>This program is protected by copyright laws.

* <br/>Program Name:

* <br/>Date:

* @author Yeeku.H.Lee kongyeeku@163.com

* @version 1.0

*/

public class TreeSetTest

{

public static void main(String[] args)

{

TreeSet nums = new TreeSet();

//向TreeSet中添加四个Integer对象

nums.add(5);

nums.add(2);

nums.add(10);

nums.add(-9);

//输出集合元素，看到集合元素已经处于排序状态

System.out.println(nums);

//输出集合里的第一个元素

System.out.println(nums.first());

//输出集合里的最后一个元素

System.out.println(nums.last());

//返回小于4的子集，不包含4

System.out.println(nums.headSet(4));

//返回大于5的子集，如果Set中包含5，子集中还包含5

System.out.println(nums.tailSet(5));

//返回大于等于-3，小于4的子集。

System.out.println(nums.subSet(-3 , 4));

}

}