简易学生成绩管理管理系统（java描述）

Posted 2020-10-21 jeavenwong

没正式学过java，但是系统学过C++后，初略的看了下java的基本语法，于是我就尝试着用java来写个简单的学生管理系统，功能不齐全，以后有空再补充吧。

写的时候定义了不同的包名字，如jeaven1 , jeaven2 , jeaven3

先上Student类：

 1 package jeaven1;
 2 import java.io.*;
 3 
 4 public class Student
 5 {
 6     private String name;
 7     private String id;
 8     private String sex;
 9     private int age;
10     private double grade;
11     public Student next; //public给外部直接访问next的权限
12     
13     public Student(String _name,String _id,String _sex,int _age,double _grade)
14     {
15         this.name = _name;
16         this.id = _id;
17         this.sex = _sex;
18         this.age = _age;
19         this.grade = _grade;
20         this.next = null;
21     }
22     
23     public Student()
24     {
25         this.name = "null";
26         this.id = "null";
27         this.sex = "null";
28         this.age = 0;
29         this.grade = 0;
30         this.next = null;
31     }
32     
33     public void show()
34     {
35         System.out.println("名字："+name+" "+"学号："+id+" "+"性别："+sex+" "+"年龄："+age+" "+"成绩："+grade);
36     }
37 }
38 

再上stulist类

 1 package jeaven2;
 2 import java.io.*;
 3 import jeaven1.Student;
 4 import java.util.Scanner;
 5 
 6 public class stulist
 7 {
 8     private Student head; //头节点
 9     private int num; //存储学生信息个数
10     public stulist()
11     {
12         head = new Student();
13         num = 0;
14     }
15     
16     public void Insert()
17     {
18         String _name,_id,_sex;
19         int _age;
20         double _grade;
21         Scanner in = new Scanner(System.in);
22         System.out.printf("请输入学生姓名: ");
23         _name = in.nextLine();
24         System.out.printf("请输入学生学号: ");
25         _id = in.nextLine();
26         System.out.printf("请输入学生性别: ");
27         _sex = in.nextLine();
28         System.out.printf("请输入学生年龄: ");
29         _age = in.nextInt();
30         System.out.printf("请输入学生成绩: ");
31         _grade = in.nextDouble();
32         System.out.printf("\\n");
33         Student newstu = new Student(_name,_id,_sex,_age,_grade);
34         Student p = head;
35         while(p.next != null)
36         {
37             p = p.next;
38         }
39         p.next = newstu;
40         newstu.next = null;
41         num ++;
42     }
43     
44     public void display()
45     {
46         Student p = head.next;
47         while(p != null)
48         {
49             p.show();
50             p = p.next;
51         }
52         if(num == 0)
53             System.out.println("此时没有任何学生的信息...");
54     }
55 }

再上main类

 1 package jeaven3;
 2 import jeaven1.Student;
 3 import jeaven2.stulist;
 4 
 5 public class main
 6 {
 7     public static void main(String[] args)
 8     {
 9         stulist list = new stulist();
10         list.Insert();
11         list.Insert();
12         list.display();
13     }
14 }

在windows下cmd中编译：

运行结果：

 

如有不对，欢迎批评指针~