简易学生成绩管理管理系统（java描述）

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：

 package jeaven1;
 import java.io.*;

 public class Student
 {
     private String name;
     private String id;
     private String sex;
     private int age;
     private double grade;
     public Student next; //public给外部直接访问next的权限

     public Student(String _name,String _id,String _sex,int _age,double _grade)
     {
         this.name = _name;
         this.id = _id;
         this.sex = _sex;
         this.age = _age;
         this.grade = _grade;
         this.next = null;
     }

     public Student()
     {
         this.name = "null";
         this.id = "null";
         this.sex = "null";
         this.age = 0;
         this.grade = 0;
         this.next = null;
     }

     public void show()
     {
         System.out.println("名字："+name+" "+"学号："+id+" "+"性别："+sex+" "+"年龄："+age+" "+"成绩："+grade);
     }
 }

再上stulist类

 package jeaven2;
 import java.io.*;
 import jeaven1.Student;
 import java.util.Scanner;

 public class stulist
 {
     private Student head; //头节点
     private int num; //存储学生信息个数
     public stulist()
     {
         head = new Student();
         num = 0;
     }

     public void Insert()
     {
         String _name,_id,_sex;
         int _age;
         double _grade;
         Scanner in = new Scanner(System.in);
         System.out.printf("请输入学生姓名: ");
         _name = in.nextLine();
         System.out.printf("请输入学生学号: ");
         _id = in.nextLine();
         System.out.printf("请输入学生性别: ");
         _sex = in.nextLine();
         System.out.printf("请输入学生年龄: ");
         _age = in.nextInt();
         System.out.printf("请输入学生成绩: ");
         _grade = in.nextDouble();
         System.out.printf("\n");
         Student newstu = new Student(_name,_id,_sex,_age,_grade);
         Student p = head;
         while(p.next != null)
         {
             p = p.next;
         }
         p.next = newstu;
         newstu.next = null;
         num ++;
     }

     public void display()
     {
         Student p = head.next;
         while(p != null)
         {
             p.show();
             p = p.next;
         }
         if(num == 0)
             System.out.println("此时没有任何学生的信息...");
     }
 }

再上main类

 package jeaven3;
 import jeaven1.Student;
 import jeaven2.stulist;

 public class main
 {
     public static void main(String[] args)
     {
         stulist list = new stulist();
         list.Insert();
         list.Insert();
         list.display();
     }
 }

在windows下cmd中编译：

运行结果：

如有不对，欢迎批评指针~