本文实例讲述了java实现List中对象排序的方法。分享给大家供大家参考,具体如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
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; } } |
希望本文所述对大家Java程序设计有所帮助。