Comparator的基本用法

package com.njupt.acm;

import java.util.Arrays;
import java.util.Comparator;


public class TestComparator {

	public static void main(String[] args) {
		Node[] node = new Node[5];
		
		System.out.println(node.length);
		
		for(int i = 0 ; i < 5 ; ++i ){
			node[i] = new Node();
			
			node[i].cost = i;
		}
		MyComparator mc = new MyComparator();
		
		
		Arrays.sort(node, mc);
		
		System.out.println(Arrays.toString(node));
	}
}

class MyComparator implements Comparator<Node>{

	@Override
	public int compare(Node n1, Node n2) {

		//降序
		if(n1.cost < n2.cost){
			return 1;
		}
		return -1;
	}

	
	
}


class Node{
	
	int day = 0 ;
	int cost = 0;
	
	@Override
	public String toString() {
		return " " + cost +" ";
	}
}