1 import java.util.ArrayList;
2 import java.util.Collections;
3 import java.util.Comparator;
4
5 class Teacher_Main {
6 public static void main(String[] args) {
7
8 ArrayList<Teacher> teacherList = new ArrayList<Teacher>();
9 teacherList.add(new Teacher("污老湿", 35));
10 teacherList.add(new Teacher("污老人", 15));
11 teacherList.add(new Teacher("污小人", 7));
12 teacherList.add(new Teacher("污大人", 99));
13
14
15 Collections.sort(teacherList, new Comparator<Teacher>() {
16
17 @Override
18 public int compare(Teacher o1, Teacher o2) {
19 if (o1.age > o2.age) {
20 return -1;
21 } else if (o1.age < o2.age) {
22 return 1;
23 }
24 return 0;
25 }
26
27 });
28 for (int i = 0; i < teacherList.size(); i++) {
29 Teacher teacher = teacherList.get(i);
30 System.out.println(teacher);
31
32 }
33 }
34 }
35
36
37
38
39
40 class Teacher {
41 public String name;
42 public int age;
43
44 public Teacher(String name, int age) {
45 this.name = name;
46 this.age = age;
47 }
48
49 @Override
50 public String toString()/*转成字符串类型*/ {
51 return name + ":" + +age;
52 }
53
54 }
