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("
");
        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~