java中对List中对象排序实现

Posted 2020-08-22 Henu丶雨巷

package com.test;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;



public class NewsManager {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

		List newss=getNewsList();
		
		for(int i=0;i<newss.size();i++)
		{
			News news=(News)newss.get(i);
			
			System.out.println("id:"+news.getId());
			System.out.println("title:"+news.getTitle());
			System.out.println("hits:"+news.getHits());
			
		}

	}
	
	
	public static List getNewsList()
	{
		
		List list=new ArrayList();
		
		News news1=new News();
		news1.setHits(1);
		news1.setId(1);
		news1.setTitle("test1");
		list.add(news1);
		
		News news2=new News();
		news2.setHits(7);
		news2.setId(2);
		news2.setTitle("test2");
		list.add(news2);
		
		News news3=new News();
		news3.setHits(3);
		news3.setId(3);
		news3.setTitle("test3");
		list.add(news3);
		
		News news4=new News();
		news4.setHits(5);
		news4.setId(4);
		news4.setTitle("test4");
		list.add(news4);
		
		
		// 按点击数倒序
		Collections.sort(list, new Comparator<News>() {
			public int compare(News arg0, News arg1) {
				int hits0 = arg0.getHits();
				int hits1 = arg1.getHits();
				if (hits1 > hits0) {
					return 1;
				} else if (hits1 == hits0) {
					return 0;
				} else {
					return -1;
				}
			}
		});
		
		return list;
	}

}