java中list里面存放map，根据map中的某一个字段进行排序

1. package com;
2. import java.util.ArrayList;
3. import java.util.Collections;
4. import java.util.Comparator;
5. import java.util.HashMap;
6. import java.util.List;
7. import java.util.Map;
8. public class Com {
9. /**
10. * @param args
11. */
12. @SuppressWarnings({ "rawtypes", "unchecked" })
13. public static void main(String[] args) {
14. // TODO Auto-generated method stub
15. List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
16. Map<String, Object> map1 = new HashMap<String, Object>();
17. map1.put("id", "1");
18. map1.put("name", "p");
19. Map<String, Object> map2 = new HashMap<String, Object>();
20. map2.put("id", "2");
21. map2.put("name", "h");
22. Map<String, Object> map3 = new HashMap<String, Object>();
23. map3.put("id", "3");
24. map3.put("name", "f");
25. list.add(map1);
26. list.add(map3);
27. list.add(map2);
28. //排序前
29. for (Map<String, Object> map : list) {
30. System.out.println(map.get("id"));
31. }
32. Collections.sort(list, new Comparator<Map<String, Object>>(){
33. public int compare(Map<String, Object> o1, Map<String, Object> o2) {
34. String name1 =(String)o1.get("id");//name1是从你list里面拿出来的一个
35. String name2= (String)o2.get("id"); //name1是从你list里面拿出来的第二个name
36. return name1.compareTo(name2);
37. }
38. });
39. //排序后
40. System.out.println("-------------------");
41. for (Map<String, Object> map : list) {
42. System.out.println(map.get("id"));
43. }
44. }
45. }

运行结果是：

1

3

2

[java]view plaincopy

1. -------------------

1

2

3

转自：http://blog.csdn.net/g631521612/article/details/8768658