TreeMap使用

package sxt.gaoqi.container;

import java.util.Map;
import java.util.TreeMap;

/*
 * 测试TreeMap的使用
 */
public class TestTreeMap
{
	public static void main(String[] args)
	{
		Map<Integer, String> treeMap = new TreeMap<>();
		
		treeMap.put(3, "森");
		treeMap.put(2, "莹");
		treeMap.put(1, "宝");
		
		for(Integer key : treeMap.keySet())
		{
			System.out.println(key + "----" + treeMap.get(key));
		}
		
		Map<Emp, String> treeMap2 = new TreeMap<>();
		treeMap2.put(new Emp(2, 9000.0), "小明");
		treeMap2.put(new Emp(6, 6000.0), "小明");
		treeMap2.put(new Emp(4, 7000.0), "小明");
		treeMap2.put(new Emp(5, 6000.0), "小明");
		
		for(Emp key : treeMap2.keySet())
		{
			System.out.println(key);
		}
		
	}
}

class Emp implements Comparable<Emp>
{

	int id;
	double salary;
	
	public Emp(int id, double salary)
	{
		this.id = id;
		this.salary = salary;
	}

	@Override
	public int compareTo(Emp o)
	{
		if(this.salary < o.salary)
		{
			return -1;
		}
		else if(this.salary > o.salary)
		{
			return 1;
		}
		else
		{
			if(this.id < o.id)
			{
				return 1;
			}
			else if(this.id > o.id)
			{
				return -1;
			}
			else
			{
				return 0;
			}
		}
	}
	
	@Override
	public String toString()
	{
		return "id: " + id + "salary: " + salary;
	}
	
}