Java学生成绩系统

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package text;
public class helloworld{
    private String stunumber;
    private String name;
    private double mathematicsscore;
    private double englishiscore;
    private double networkscore;
    private double databasescore;
    private double softwarescore;
    public helloworld() {}
    public helloworld(String stunumber,String name,double mathematicsscore,double englishiscore,double networkscore,double databasescore,double softwarescore)
    {
        this.stunumber=stunumber;
        this.name=name;
        this.mathematicsscore=mathematicsscore;
        this.englishiscore=englishiscore;
        this.networkscore=networkscore;
        this.databasescore=databasescore;
        this.softwarescore=softwarescore;
    }
    public String getstunumber() {
        return stunumber;
    }
    public void setstunumber(String a) {
        stunumber=a;
    }
    public String getname() {
        return name;
    }
    public void setname(String a) {
        name=a;
    }
    public Double getmathematicsscore() {
        return mathematicsscore;
    }
    public void setmathematicsscore(double a) {
        mathematicsscore=a;
    }
    public Double getenglishiscore() {
        return englishiscore;
    }
    public void setenglishiscore(double a) {
        englishiscore=a;
    }
    public Double getnetworkscore() {
        return networkscore;
    }
    public void setnetworkscore(double a) {
        networkscore=a;
    }
    public Double getdatabasescore() {
        return databasescore;
    }
    public void setdatabasescore(double a) {
        databasescore=a;
    }
    public Double getsoftwarescore() {
        return softwarescore;
    }
    public void setsoftwarescore(double a) {
        softwarescore=a;
    }
}
package text;
import java.util.Scanner;
//姓名 冯静妃   学号 20183610   班级 信1805-3班
public class ScoreManagement {
    public static void  main(String[] args) {
        Scanner a = new Scanner(System.in);
        // 定义数组预存五个学生的姓名以及学号;
        helloworld[] stu = new helloworld[5];
        stu[0] = new helloworld("20183606", "晏雯慧",0,0,0,0,0);
        stu[1] = new helloworld("20183607", "徐娇美",2,2,2,2,2);
        stu[2] = new helloworld("20183608", "杨一帆",3,3,3,3,3);
        stu[3] = new helloworld("20183609", "胡海靖",4,4,4,4,4);
        stu[4] = new helloworld("20183610", "冯静妃",5,5,5,5,5);
        show(stu);
    }
    public static void show(helloworld[] stu) {//show函数显示主页面
        System.out.println("****************************************");
        System.out.println("       石家庄铁道大学软件工程系           ");
        System.out.println("      学生学籍管理系统2019班版");
        System.out.println("****************************************");
        System.out.println("      1.学生老师成绩录入        ");
        System.out.println("      2.学生考试成绩修改        ");
        System.out.println("      3.计算学生成绩绩点        ");
        System.out.println("      4.退出学籍管理系统        ");
        System.out.println("*****************************************");
        Scanner a = new Scanner(System.in);// 输入选项
        int choice = a.nextInt();
        switch(choice) {
            case 1:add(stu);break;//考试成绩录入
            case 2:change(stu);break;//考试成绩修改
            case 3:jisuan(stu);break;//计算学生成绩
            case 4:finish();break;//退出系统
            default:
            {
                System.out.println("信息错误，该选项不存在");
                show(stu);
                break;
            }
        }
    }
    public static void add(helloworld[] stu) {//学生信息的录入
        System.out.println("****************************************");
        System.out.println("   石家庄铁道大学软件工程系学生学籍管理系统2019版      ");
        System.out.println("          学生考试成绩录入界面           ");
        System.out.println("****************************************");
        System.out.print("         学生学号：        ");
        Scanner sd = new Scanner(System.in);
        String number = sd.nextLine();
        int flag = 0,i;
        for (i = 0; i < 5; i++)
        {
            if (number.equals(stu[i].getstunumber()))
            {
        System.out.println("*********************************************");
                System.out.println("     石家庄铁道大学软件工程系学生学籍管理系统 2019 版   ");
                System.out.println("     学生学号："+stu[i].getstunumber()   );
                System.out.println("     学生姓名："+stu[i].getname()      );
                System.out.println("     请输入高等数学成绩："     );
                System.out.println("***********************************************");
                double math = sd.nextDouble();
                System.out.println(stu[i].getname() + "的高数成绩是:" + math);
                System.out.print("请输入该生的英语成绩");
                double english = sd.nextDouble();
                System.out.println(stu[i].getname() + "的英语成绩是:" + english);
                System.out.print("请输入该生的计算机网络成绩");
                double network = sd.nextDouble();
                System.out.println(stu[i].getname() + "的计算机网络成绩是:" + network);
                System.out.print("请输入该生的数据库成绩");
                double data = sd.nextDouble();
                System.out.println(stu[i].getname() + "的数据库成绩是:" + data);
                System.out.print("请输入该生的软件成绩");
                double soft = sd.nextDouble();
                System.out.println("********************************************");
                System.out.println("    石家庄铁道大学软件工程系学生学籍管理系统 2019 版");
                System.out.println("     学生姓名："+stu[i].getname());
                System.out.println("      高等数学成绩："+math);
                System.out.println("      大学英语成绩："+english);
                System.out.println("      计算机网络成绩："+network);
                System.out.println("      数据库成绩："+data);
                System.out.println("      软件工程成绩："+soft);
                System.out.print("     该学生成绩已录入完毕，是否提交（Y/N）");
                System.out.println("**********************************************");
                if (sd.next().equals("Y"))
                {
                    stu[i].setenglishiscore(english);
                    stu[i].setmathematicsscore(math);
                    stu[i].setdatabasescore(data);
                    stu[i].setnetworkscore(network);
                    stu[i].setsoftwarescore(soft);
                    show(stu);
                } else
                {
                    System.out.println("返回录入页面");
                    add(stu);
                }
                flag = 1;
            }
        }
        // 如果没有该学生信息，提示重新输入。
        if (flag == 0)
        {
            System.out.println("该学号不存在，请重新输入");
            add(stu);
        }
    }
    public static void change(helloworld[] stu)//学生成绩修改
    {
        Scanner a = new Scanner(System.in);
        System.out.println("******************************************");
        System.out.println("石家庄铁道大学软件工程系学生学籍管理系统2019版");
        System.out.println("学生考试成绩修改页面");
        System.out.println("*******************************************");
        System.out.print("请输入学生学号：");
        String number = a.nextLine();
        int flag = 0;
        for (int i = 0; i < 5; i++)
        {
            if (stu[i].getstunumber().equals(number))
            {
                System.out.println("***********************************************");
                System.out.println("石家庄铁道大学软件工程系学生学籍管理系统 2019 版");
                System.out.println("学生考试成绩录入");
        System.out.println("*************************************************");
                System.out.println("    学生学号："+stu[i].getstunumber());
                System.out.println("    学生姓名："+stu[i].getname());
                System.out.println("    1、高等数学成绩："+stu[i].getmathematicsscore());
                System.out.println("    2、大学英语成绩：" + stu[i].getenglishiscore());
                System.out.println("    3、计算机网络成绩：" + stu[i].getnetworkscore());
                System.out.println("    4、数据库成绩：" + stu[i].getdatabasescore());
                System.out.println("    5、软件工程成绩：" + stu[i].getsoftwarescore());
                System.out.println("**************************************************");
                int select = a.nextInt();
                double chang=0;
                switch (select)
                {
                case 1:
                    System.out.println("       学生考试成绩录入界面             ");
                    System.out.println("*****************************************");
                    System.out.println("         学生学号："+stu[i].getstunumber());
                    System.out.println("         学生姓名："+stu[i].getname());
                    System.out.print("         请输入修改后的高数成绩：");
                    chang=a.nextDouble();
                    System.out.println("********************************************************");
                    System.out.println("         石家庄铁道大学软件工程系学生学籍管理系统                     ");
                    System.out.println("*********************************************************");
                    System.out.println("     学生学号："+stu[i].getstunumber());
                    System.out.println("     学生姓名："+stu[i].getname());
                    System.out.println("     1、高等数学成绩："+chang);
                    System.out.println("     2、大学英语成绩：" + stu[i].getenglishiscore());
                    System.out.println("     3、计算机网络成绩：" + stu[i].getnetworkscore());
                    System.out.println("     4、数据库成绩：" + stu[i].getdatabasescore());
                    System.out.println("     5、软件工程成绩：" + stu[i].getsoftwarescore());
                    System.out.println("********************************************************");
                    System.out.print("     该学生成绩已修改完毕，是否提交（Y/N）");
                    System.out.println("**********************************************************");
                    if(a.next().equals("Y")) {
                        stu[i].setmathematicsscore(chang);
                        show(stu);
                    }
                    else {
                        change(stu);
                    }
                    break;
                case 2:
                    System.out.println("       学生考试成绩录入界面             ");
                    System.out.println("*****************************************");
                    System.out.println("         学生学号："+stu[i].getstunumber());
                    System.out.println("         学生姓名："+stu[i].getname());
                    System.out.print("         请输入修改后的大学英语成绩：");
                    chang=a.nextDouble();
                    System.out.println("********************************************************");
                    System.out.println("         石家庄铁道大学软件工程系学生学籍管理系统                     ");
                    System.out.println("*********************************************************");
                    System.out.println("     学生学号："+stu[i].getstunumber());
                    System.out.println("     学生姓名："+stu[i].getname());
                    System.out.println("     1、高等数学成绩："+stu[i].getmathematicsscore());
                    System.out.println("     2、大学英语成绩：" + chang);
                    System.out.println("     3、计算机网络成绩：" + stu[i].getnetworkscore());
                    System.out.println("     4、数据库成绩：" + stu[i].getdatabasescore());
                    System.out.println("     5、软件工程成绩：" + stu[i].getsoftwarescore());
                    System.out.println("********************************************************");
                    System.out.println("     该学生成绩已修改完毕，是否提交（Y/N）");
                    System.out.println("**********************************************************");
                    if(a.next().equals("Y")) {
                        stu[i].setenglishiscore(chang);
                        show(stu);
                    }
                    else {
                        change(stu);
                    }
                    break;
                case 3:
                    System.out.println("       学生考试成绩录入界面             ");
                    System.out.println("*****************************************");
                    System.out.println("         学生学号："+stu[i].getstunumber());
                    System.out.println("         学生姓名："+stu[i].getname());
                    System.out.print("         请输入修改后的计算机网络成绩：");
                    chang=a.nextDouble();
                    System.out.println("********************************************************");
                    System.out.println("         石家庄铁道大学软件工程系学生学籍管理系统                     ");
                    System.out.println("*********************************************************");
                    System.out.println("     学生学号："+stu[i].getstunumber());
                    System.out.println("     学生姓名："+stu[i].getname());
                    System.out.println("     1、高等数学成绩："+stu[i].getmathematicsscore());
                    System.out.println("     2、大学英语成绩：" + stu[i].getenglishiscore());
                    System.out.println("     3、计算机网络成绩：" + chang);
                    System.out.println("     4、数据库成绩：" + stu[i].getdatabasescore());
                    System.out.println("     5、软件工程成绩：" + stu[i].getsoftwarescore());
                    System.out.println("********************************************************");
                    System.out.print("     该学生成绩已修改完毕，是否提交（Y/N）");
                    System.out.println("**********************************************************");
                    if(a.next().equals("Y")) {
                        stu[i].setnetworkscore(chang);
                        show(stu);
                    }
                    else {
                        change(stu);
                    }
                    break;
                case 4:
                    System.out.println("       学生考试成绩录入界面             ");
                    System.out.println("*****************************************");
                    System.out.println("         学生学号："+stu[i].getstunumber());
                    System.out.println("         学生姓名："+stu[i].getname());
                    System.out.print("         请输入修改后的数据库成绩：");
                    chang=a.nextDouble();
                    System.out.println("********************************************************");
                    System.out.println("         石家庄铁道大学软件工程系学生学籍管理系统                     ");
                    System.out.println("*********************************************************");
                    System.out.println("     学生学号："+stu[i].getstunumber());
                    System.out.println("     学生姓名："+stu[i].getname());
                    System.out.println("     1、高等数学成绩："+stu[i].getmathematicsscore());
                    System.out.println("     2、大学英语成绩：" + stu[i].getenglishiscore());
                    System.out.println("     3、计算机网络成绩：" + stu[i].getnetworkscore());
                    System.out.println("     4、数据库成绩：" + chang);
                    System.out.println("     5、软件工程成绩：" + stu[i].getsoftwarescore());
                    System.out.println("********************************************************");
                    System.out.print("     该学生成绩已修改完毕，是否提交（Y/N）");
                    System.out.println("**********************************************************");
                    if(a.next().equals("Y")) {
                        stu[i].setdatabasescore(chang);
                        show(stu);
                    }
                    else {
                        change(stu);
                    }
                    break;
                case 5:
                    System.out.println("       学生考试成绩录入界面             ");
                    System.out.println("*****************************************");
                    System.out.println("         学生学号："+stu[i].getstunumber());
                    System.out.println("         学生姓名："+stu[i].getname());
                    System.out.print("         请输入修改后的软件工程成绩：");
                    chang=a.nextDouble();
                    System.out.println("********************************************************");
                    System.out.println("         石家庄铁道大学软件工程系学生学籍管理系统                     ");
                    System.out.println("*********************************************************");
                    System.out.println("     学生学号："+stu[i].getstunumber());
                    System.out.println("     学生姓名："+stu[i].getname());
                    System.out.println("     1、高等数学成绩："+stu[i].getmathematicsscore());
                    System.out.println("     2、大学英语成绩：" + stu[i].getenglishiscore());
                    System.out.println("     3、计算机网络成绩：" + stu[i].getnetworkscore());
                    System.out.println("     4、数据库成绩：" + stu[i].getdatabasescore());
                    System.out.println("     5、软件工程成绩：" + chang);
                    System.out.println("********************************************************");
                    System.out.print("     该学生成绩已修改完毕，是否提交（Y/N）");
                    System.out.println("**********************************************************");
                    if(a.next().equals("Y")) {
                        stu[i].setsoftwarescore(chang);
                        show(stu);
                    }
                    else {
                        change(stu);
                    }
                    break;
                default:
                    System.out.println("请输入正确信息");
                    change(stu);
                    break;
                }
                flag = 1;
            }
        }
        if (flag == 0)
        {
            System.out.println("学号输入错误，请重新输入学号");
            change(stu);
        }
    }
    static void jisuan(helloworld[] stu) {//计算学生成绩绩点
        System.out.println("******************************************");
        System.out.println("   石家庄铁道大学软件工程系学生学籍管理系统2019版    ");
        System.out.println("     学生考试成绩绩点计算界面    ");
        System.out.println("*******************************************");
        System.out.print("     请输入学生学号：");
        Scanner a=new Scanner(System.in);
        String number=a.nextLine();
        System.out.println("*********************************************");
        System.out.println("**********************************************");
        System.out.println("     石家庄铁道大学软甲工程系学生学籍管理系统2019版");
        System.out.println("            学生考试成绩绩点计算界面");
        System.out.println("************************************************");
        System.out.println("     学生学号："+number);
        int i;
        double gao=0,ying=0,ji=0,shu=0,ruan=0;
        for(i=0;i<5;i++)
            if (stu[i].getstunumber().equals(number))
            {
                System.out.println("      学生姓名："+stu[i].getname());
                //计算高等数学的成绩绩点
                if(stu[i].getmathematicsscore()>=90)  
                    gao=4.0;
                else if(stu[i].getmathematicsscore()>=85&&stu[i].getmathematicsscore()<=89.9)
                    gao=3.7;
                else if(stu[i].getmathematicsscore()>=82&&stu[i].getmathematicsscore()<=84.9)
                    gao=3.3;
                else if(stu[i].getmathematicsscore()>=78&&stu[i].getmathematicsscore()<=81.9)
                    gao=2.7;
                else if(stu[i].getmathematicsscore()>=75&&stu[i].getmathematicsscore()<=77.9)
                    gao=2.3;
                else if(stu[i].getmathematicsscore()>=72&&stu[i].getmathematicsscore()<=74.9)
                    gao=2.0;
                else if(stu[i].getmathematicsscore()>=68&&stu[i].getmathematicsscore()<=71.9)
                    gao=1.7;
                else if(stu[i].getmathematicsscore()>=66&&stu[i].getmathematicsscore()<=67.9)
                    gao=1.5;
                else if(stu[i].getmathematicsscore()>=64&&stu[i].getmathematicsscore()<=65.9)
                    gao=1.0;
                else if(stu[i].getmathematicsscore()<60)
                    gao=0;
                System.out.println("      1.高等数学成绩绩点："+gao);
                //计算大学英语成绩绩点
                if(stu[i].getenglishiscore()>=90)  
                    ying=4.0;
                else if(stu[i].getenglishiscore()>=85&&stu[i].getenglishiscore()<=89.9)
                    ying=3.7;
                else if(stu[i].getenglishiscore()>=82&&stu[i].getenglishiscore()<=84.9)
                    ying=3.3;
                else if(stu[i].getenglishiscore()>=78&&stu[i].getenglishiscore()<=81.9)
                    ying=2.7;
                else if(stu[i].getenglishiscore()>=75&&stu[i].getenglishiscore()<=77.9)
                    ying=2.3;
                else if(stu[i].getenglishiscore()>=72&&stu[i].getenglishiscore()<=74.9)
                    ying=2.0;
                else if(stu[i].getenglishiscore()>=68&&stu[i].getenglishiscore()<=71.9)
                    ying=1.7;
                else if(stu[i].getenglishiscore()>=66&&stu[i].getenglishiscore()<=67.9)
                    ying=1.5;
                else if(stu[i].getenglishiscore()>=64&&stu[i].getenglishiscore()<=65.9)
                    ying=1.0;
                else if(stu[i].getenglishiscore()<60)
                    ying=0;
                System.out.println("      2.大学英语成绩绩点："+ying);
                //计算计算机网络成绩绩点
                if(stu[i].getnetworkscore()>=90)  
                    ji=4.0;
                else if(stu[i].getnetworkscore()>=85&&stu[i].getnetworkscore()<=89.9)
                    ji=3.7;
                else if(stu[i].getnetworkscore()>=82&&stu[i].getnetworkscore()<=84.9)
                    ji=3.3;
                else if(stu[i].getnetworkscore()>=78&&stu[i].getnetworkscore()<=81.9)
                    ji=2.7;
                else if(stu[i].getnetworkscore()>=75&&stu[i].getnetworkscore()<=77.9)
                    ji=2.3;
                else if(stu[i].getnetworkscore()>=72&&stu[i].getnetworkscore()<=74.9)
                    ji=2.0;
                else if(stu[i].getnetworkscore()>=68&&stu[i].getnetworkscore()<=71.9)
                    ji=1.7;
                else if(stu[i].getnetworkscore()>=66&&stu[i].getnetworkscore()<=67.9)
                    ji=1.5;
                else if(stu[i].getnetworkscore()>=64&&stu[i].getnetworkscore()<=65.9)
                    ji=1.0;
                else if(stu[i].getnetworkscore()<60)
                    ji=0;
                System.out.println("      3.计算机网络成绩绩点："+ji);
                //计算数据库成绩绩点
                if(stu[i].getdatabasescore()>=90)  
                    shu=4.0;
                else if(stu[i].getdatabasescore()>=85&&stu[i].getdatabasescore()<=89.9)
                    shu=3.7;
                else if(stu[i].getdatabasescore()>=82&&stu[i].getdatabasescore()<=84.9)
                    shu=3.3;
                else if(stu[i].getdatabasescore()>=78&&stu[i].getdatabasescore()<=81.9)
                    shu=2.7;
                else if(stu[i].getdatabasescore()>=75&&stu[i].getdatabasescore()<=77.9)
                    shu=2.3;
                else if(stu[i].getdatabasescore()>=72&&stu[i].getdatabasescore()<=74.9)
                    shu=2.0;
                else if(stu[i].getdatabasescore()>=68&&stu[i].getdatabasescore()<=71.9)
                    shu=1.7;
                else if(stu[i].getdatabasescore()>=66&&stu[i].getdatabasescore()<=67.9)
                    shu=1.5;
                else if(stu[i].getdatabasescore()>=64&&stu[i].getdatabasescore()<=65.9)
                    shu=1.0;
                else if(stu[i].getdatabasescore()<60)
                    shu=0;
                System.out.println("      4.数据库成绩绩点："+shu);
                //计算软件工程成绩绩点
                if(stu[i].getdatabasescore()>=90)  
                    ruan=4.0;
                else if(stu[i].getdatabasescore()>=85&&stu[i].getdatabasescore()<=89.9)
                    ruan=3.7;
                else if(stu[i].getdatabasescore()>=82&&stu[i].getdatabasescore()<=84.9)
                    ruan=3.3;
                else if(stu[i].getdatabasescore()>=78&&stu[i].getdatabasescore()<=81.9)
                    ruan=2.7;
                else if(stu[i].getdatabasescore()>=75&&stu[i].getdatabasescore()<=77.9)
                    ruan=2.3;
                else if(stu[i].getdatabasescore()>=72&&stu[i].getdatabasescore()<=74.9)
                    ruan=2.0;
                else if(stu[i].getdatabasescore()>=68&&stu[i].getdatabasescore()<=71.9)
                    ruan=1.7;
                else if(stu[i].getdatabasescore()>=66&&stu[i].getdatabasescore()<=67.9)
                    ruan=1.5;
                else if(stu[i].getdatabasescore()>=64&&stu[i].getdatabasescore()<=65.9)
                    ruan=1.0;
                else if(stu[i].getdatabasescore()<60)
                    ruan=0;
                System.out.println("      5.软件工程成绩绩点："+ruan);
                //计算平均学分绩点
                double average=0;
                average=(gao*4+ying*3+ji*4+shu*3+ruan*2)/16;
                String result=String.format("%.2f",average);
                System.out.println("    你的平均学分绩点为："+result);
                if(average>=2)
                    System.out.println("提示信息：你的学分绩点已达到毕业要求！");
                else
                    System.out.println("提示信息：你的学分绩点不满足毕业要求！");
                System.out.println("      是否返回系统主界面：（Y/N）");
                System.out.println("**************************************");
                if(a.next().equals("Y")) {
                    show(stu);
                }
                else
                break;
            }
    }
    static void finish() {//退出当前程序
        System.out.println("********************************************");
        System.out.println("   石家庄铁道大学软件工程系学生学籍管理系统2019版");
        System.out.println("             制作人：冯静妃");
        System.out.println("********************************************");
    }
}<br>录入成绩运行结果：
1	`修改成绩运行结果：计算绩点运行结果：退出系统运行结果：`
这个学生成绩录入、修改、计算系统的代码并不难，大概思路就是创建学生信息类，在主函数下面，构造录入、修改、计算函数，但是我一下午也没写完。我想归根结底的原因还是，动手练习的太少，假期的时间没有充分利用，所有的学习时间内，几乎都是在看书，而不是敲代码，我认为这是最致命的不足。有了这一次印象深刻的经历，在之后的学习中，还是应该多动手，坚持每天抽出时间来练习，重复做题变熟练，增加经验，提高手速，利用好空闲时间。