testtreeset3.java

来自「疯狂Java讲义_源码(含Java设计模式CHM」· Java 代码 · 共 65 行

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
 */
class M
{
	int age;
	public M(int age)
	{
		this.age = age;
	}
}
class N
{
	int age;
	public N(int age)
	{
		this.age = age;
	}
}
public class TestTreeSet3
{
	public static void main(String[] args) 
	{
		TreeSet ts = new TreeSet(new Comparator()
		{
			public int compare(Object o1, Object o2)
			{
				int age1 = o1 instanceof M ? ((M)o1).age :((N)o1).age;
				int age2 = o1 instanceof M ? ((M)o2).age :((N)o2).age;
				return age1 - age2;

				/*
				M m1 = (M)o1;
				M m2 = (M)o2;

				if (m1.age > m2.age)
				{
					return -1;
				}
				else if (m1.age == m2.age)
				{
					return 0;
				}
				else
				{
					return 1;
				}
				*/
			}
		});	
		ts.add(new M(5));
		ts.add(new M(-3));
		ts.add(new N(9));
		System.out.println(ts);
	}
}