1 package collection;
 2 
 3 public class Student {
 4     private String name;
 5     private int age;
 6     private String sex;
 7     
 8     public Student(String name, int age, String sex) {
 9         this.name = name;
10         this.age = age;
11         this.sex = sex;
12     }
13 
14     public
 
 Student() {
15     }
16 
17     public int getAge() {
18         return age;
19     }
20 
21     public void setAge(int age) {
22         this.age = age;
23     }
24 
25     public String getSex() {
26         return sex;
27     }
28 
29     public void setSex(String sex) {
30         this.sex = sex;
 
31     }
32 
33     public String getName() {
34         return name;
35     }
36 
37     public void setName(String name) {
38         this.name = name;
39     }
40     
41     
42 }

 1 package collection;
 2 
 3 import java.util.ArrayList;
 4 import java.util.HashMap;
 5 import java.util.Map;
 
 6 import java.util.Scanner;
 7 
 8 public class Test8 {
 9     public static void main(String[] args) {
10         Scanner input=new Scanner(System.in);
11         Student student1=new Student("張三1",18,"男");
12         Student student2=new Student("張三2",18,"男");
13         Student student3=new Student("李四1",18,"男");
14         Student student4=new Student("李四2",18,"男");
15         Student student5=new Student("張晴1",16,"女");
16         Student student6=new Student("張晴2",16,"女");
17         
18         ArrayList<Student> list1=new ArrayList();
19         ArrayList<Student> list2=new ArrayList();
20         ArrayList<Student> list3=new ArrayList();
21         
22         list1.add(student1);  //在list1集合第0個位置新增元素student1
23         list1.add(student2);  //在list1集合第1個位置新增元素student2
24         list2.add(student3);  //在list2集合第0個位置新增元素student3
25         list2.add(student4);  //在list2集合第1個位置新增元素student4
26         list3.add(student5);  //在list3集合第0個位置新增元素student5
27         list3.add(student6);  //在list3集合第1個位置新增元素student6
28         
29         Map<String,ArrayList> m=new HashMap();
30         m.put("高三1班", list1);
31         m.put("高三2班", list2);
32         m.put("高三3班", list3);
33         
34         System.out.println("輸入班級名稱：");
35         String schoolClass=input.next();
36         System.out.println(schoolClass+"學生列表：");
37         ArrayList<Student> students=m.get(schoolClass);
38         for (Student stu : students) {
39             System.out.println(stu.getName()+"\t"+stu.getSex()+"\t"+stu.getAge());
40         }
41         
42     }
43 }