Java 集合框架练习

Myth丶恋晨 2021-10-29 08:40 307阅读 0赞

|--需求说明

![1713726-20190726194938453-1560804197.png][]

|--实现思路

如需求所说方式实现

|--代码内容

![ContractedBlock.gif][] ![ExpandedBlockStart.gif][]

1 public class Test {
     2     static  Scanner input = new Scanner(System.in);
     3     public static void main(String[] args) {
     4         Student stu1 = new Student("张三丰", "男", 7);
     5         Student stu2 = new Student("杨过", "男", 8);
     6         Student stu3 = new Student("郭靖", "女", 9);
     7         Student stu4 = new Student("欧阳锋", "男", 10);
     8         Student stu5 = new Student("梅超风", "女", 11);
     9         Student stu6 = new Student("韦小宝", "男", 12);
    10 
    11         ArrayList<Student> sanNianSanBan = new ArrayList<>();
    12         sanNianSanBan.add(stu1);
    13         sanNianSanBan.add(stu2);
    14         sanNianSanBan.add(stu3);
    15 
    16         ArrayList<Student> sanNianErBan = new ArrayList<>();
    17         sanNianErBan.add(stu4);
    18         sanNianErBan.add(stu5);
    19         sanNianErBan.add(stu6);
    20 
    21         HashMap<String,ArrayList> map = new HashMap<>();
    22         map.put("三年二班",sanNianErBan);
    23         map.put("三年一班",sanNianSanBan);
    24 
    25         //抽取  三年二班 的学员信息
    26         System.out.println("请输入班级名称：");
    27         String key = input.next();
    28         if (map.containsKey(key)){
    29             ArrayList<Student> list =  map.get(key);
    30             System.out.println(key+"学生列表");
    31             for (Student student : list) {
    32                 System.out.println(student.getName()+"\t"+student.getSexy()+"\t"+student.getId());
    33             }
    34         }else {
    35             System.out.println("没有找到这个班级");
    36         }
    37     }
    38 }

习题三

|--运行结果

![1713726-20190726195821857-1506458812.png][]

转载于:https://www.cnblogs.com/twuxian/p/11252530.html

[1713726-20190726194938453-1560804197.png]: /images/20211029/920e8bdc0d2f4bebbce156bb4f0e9bb6.png
[ContractedBlock.gif]: https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif
[ExpandedBlockStart.gif]: /images/20211029/1974f7ab9801437fa8359b3c70b1786e.png
[1713726-20190726195821857-1506458812.png]: /images/20211029/dcbf97b13fff40b38a7d556a9e6f05bc.png