教你用java实现学生成绩管理系统(附详细代码)

package StudentManger;
/*
学生信息：姓名，地址
 */
public class Student {
    String name;
    String address;
    int ChineseGrade;
    int MathGrade;
    int EnglishGrade;
    int sum;
    double averGrade;
 
    public int getSum() {
        return sum;
    }
 
    public void setSum(int sum) {
        this.sum = sum;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
 
    public String getAddress() {
        return address;
    }
 
    public void setAddress(String address) {
        this.address = address;
    }
 
    public int getChineseGrade() {
        return ChineseGrade;
    }
 
    public void setChineseGrade(int chineseGrade) {
        ChineseGrade = chineseGrade;
    }
 
    public int getMathGrade() {
        return MathGrade;
    }
 
    public void setMathGrade(int mathGrade) {
        MathGrade = mathGrade;
    }
 
    public int getEnglishGrade() {
        return EnglishGrade;
    }
 
    public void setEnglishGrade(int englishGrade) {
        EnglishGrade = englishGrade;
    }
 
    public double getAverGrade() {
        return averGrade;
    }
 
    public void setAverGrade(double averGrade) {
        this.averGrade = averGrade;
    }
}

package StudentManger;
 
import java.util.HashMap;
import java.util.Scanner;
import java.util.Set;
 
public class Demo {
    public static void main(String[] args) {
        //创建hashmap集合
        HashMap<Integer,Student> hashMap = new HashMap<>();
        Scanner sc = new Scanner(System.in);
        //创建开始页面
        while (true)
        {
            printview();
            System.out.println("请输入您要实现的的功能：");
            int data = sc.nextInt();
            switch (data)
            {
                case 1 : setStudent(hashMap);break;
                case 2 : delete(hashMap);break;
                case 3 : Change(hashMap);break;
                case 4 :print01(hashMap);break;
                case 5 :print02(hashMap);break;
                case 6 : System.out.println("欢迎下次使用！");System.exit(1);
            }
        }
 
    }
    public static void printview()
    {
        System.out.println("----欢迎来到学生管理系统！-----");
        System.out.println("----请选择以下对应的功能-------");
        System.out.println("-------1.添加学生信息---------");
        System.out.println("-------2.删除学生信息---------");
        System.out.println("-------3.修改学生信息---------");
        System.out.println("-------4.通过学号查看单个学生信息(通过key显示)---------");
        System.out.println("-------5.查看所有学生信息------");
        System.out.println("-------6.退出管理系统---------");
    }
 
    //添加学生信息
    public static void setStudent(HashMap<Integer,Student> hs)
    {
        Scanner sc = new Scanner(System.in);
        Student s = new Student();
        System.out.println("请输入学生的地址：");
        String address  =sc.nextLine();
        s.setAddress(address);
        System.out.println("请输入学生的姓名：");
        String name = sc.nextLine();
        s.setName(name);
        System.out.println("请输入学生的学号：");
        Integer number = sc.nextInt();
        System.out.println("请输入学生的语文成绩：");
        Integer yuwen = sc.nextInt();
        s.setChineseGrade(yuwen);
        System.out.println("请输入学生的数学成绩：");
        Integer shuxue = sc.nextInt();
        s.setMathGrade(shuxue);
        System.out.println("请输入学生的英语成绩：");
        Integer yingyu = sc.nextInt();
        s.setEnglishGrade(yingyu);
        //计算平均成绩和总体成绩
        int sum = shuxue + yuwen+yingyu;
        double aver = sum/3;
        s.setSum(sum);
        s.setAverGrade(aver);
        //将学生信息存储到hashmap中
        hs.put(number,s);
        System.out.println("添加成功！");
    }
 
    //删除学生信息
    public static void delete(HashMap<Integer,Student> hs)
    {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入您要删除学生的学号：");
        Integer number = sc.nextInt();
        if(hs.get(number)!=null)
        {
            hs.remove(number);
            System.out.println("删除成功！");
        }
        else
        {
            System.out.println("此学生不存在！");
        }
    }
 
    //显示单个学生信息
    public static void print01(HashMap<Integer,Student> hs)
    {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入您要查询的学生的学号：");
        Integer number = sc.nextInt();
        if (hs.get(number)!=null)
        {
            Student s = hs.get(number);
            System.out.println("查询成功！");
            System.out.println("学号："+number+" 姓名："+s.getName()+" 地址："+s.getAddress()+" 语文成绩："+s.getChineseGrade()+" 数学成绩："+s.getMathGrade()+" 英语成绩："+s.getEnglishGrade()+s.getAddress()+" 成绩总和："+s.getSum()+" 平均成绩："+s.getAverGrade());
        }
       else
        {
            System.out.println("该学生不存在！");
        }
    }
 
    //显示所有学生信息
    public static void print02(HashMap<Integer,Student> hs)
    {
        System.out.println("所有学生信息如下：");
        Set<Integer> set = hs.keySet();
 
        for (Integer i :set)
        {
            Student s = hs.get(i);
            System.out.println("学号："+i+" 姓名："+s.getName()+" 地址："+s.getAddress()+" 语文成绩："+s.getChineseGrade()+" 数学成绩："+s.getMathGrade()+" 英语成绩："+s.getEnglishGrade()+" 成绩总和："+s.getSum()+" 平均成绩："+s.getAverGrade());
        }
    }
 
    //修改学生信息
    public static void Change(HashMap<Integer,Student> hs)
    {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入你要修改的学生学号：");
        int number = sc.nextInt();
 
        if (hs.get(number)!=null)
        {
            Scanner sc1 = new Scanner(System.in);
            Student s = hs.get(number);
            System.out.println("请输入您要修改的学生的具体信息：(姓名，地址，语文成绩，数学成绩。英语成绩)");
            String data = sc1.nextLine();
            if (data.equals("姓名"))
            {
                System.out.println("请输入您要修改的姓名：");
                String name = sc1.nextLine();
                s.setName(name);
                System.out.println("修改完成！");
            }
 
            else if (data.equals("地址"))
            {
                System.out.println("请输入您要修改的地址：");
                String address = sc1.nextLine();
                s.setAddress(address);
                System.out.println("修改完成！");
            }
 
            else if (data.equals("语文成绩"))
            {
                System.out.println("请输入您要修改的语文成绩：");
                int ytuwen = sc1.nextInt();
                s.setChineseGrade(ytuwen);
                System.out.println("修改完成！");
            }
 
            else if (data.equals("数学成绩"))
            {
                System.out.println("请输入您要修改的数学成绩：");
                int shuXue = sc1.nextInt();
                s.setChineseGrade(shuXue);
                System.out.println("修改完成！");
            }
 
            else if (data.equals("英语成绩"))
            {
                System.out.println("请输入您要修改的英语成绩：");
                int yingyu = sc1.nextInt();
                s.setChineseGrade(yingyu);
                System.out.println("修改完成！");
            }
        }
        else
        {
            System.out.println("该学生不存在！");
        }
    }
}