9.20

合集 - 2024秋(58)

1.20249.92024-09-092.9.102024-09-113.9.112024-09-124.9.122024-09-125.9.132024-09-136.9.182024-09-187.9.192024-09-20

8.9.202024-09-20

9.9.232024-09-2310.9.242024-09-2811.9.252024-09-2812.9.262024-09-2813.9.272024-09-2814.9.282024-09-2815.10.142024-10-1416.10.152024-10-1517.10.162024-10-1618.10.172024-10-1719.10.182024-10-2020.10.202024-10-2021.10.212024-10-2122.MySQL DQL 10.222024-10-2223.MySQL事件2024-10-2824.MySQL DDL操作数据库笔记2024-10-2125.MySQL DDL操作表2024-10-2226.MySQL DML操作数据2024-10-2227.MySQL 约束2024-10-2828.Mybatis修改2024-11-0229.Mybatis添加&修改2024-11-0230.MyBatis查询2024-10-2831.MySQL 多表查询2024-10-2832.JavaScript 对象2024-11-0233.JavaScript基础语法2024-11-0234.JavaScript引入方式2024-11-0235.CSS2024-11-0236.HTML标签2024-11-0237.HTML介绍&快速入门2024-11-0238.Mybatis参数传递&注解开发2024-11-0239.JavaScript BOM2024-11-0240.JavaScript DOM2024-11-0341.JavaScript 事件监听2024-11-0342.JavaScript 正则表达式2024-11-0343.Tomcat2024-11-0944.Servlet入门2024-11-0945.Servlet生命周期与方法2024-11-0946.Jsp if判断2024-12-0247.《程序员修炼之道：从小工到专家》读书笔记——12024-12-2348.《程序员修炼之道：从小工到专家》读书笔记——22024-12-2349.《程序员修炼之道：从小工到专家》读书笔记——32024-12-2350.《程序员修炼之道：从小工到专家》读书笔记——42024-12-2451.《程序员修炼之道：从小工到专家》读书笔记——52024-12-2452.《程序员修炼之道：从小工到专家》读书笔记——62024-12-2453.《程序员修炼之道：从小工到专家》读书笔记——72024-12-2554.《程序员修炼之道：从小工到专家》读书笔记——82024-12-2555.《程序员修炼之道：从小工到专家》读书笔记——92024-12-2556.自动生成序号函数2024-12-2557.用户修改密码（前端与后端）2024-12-2558.案例:请假条管理系统2024-11-222024-12-26

收起

今天进行了java的二次测试，了解了java里基本的增删改查的功能；以及查找时报错等细节处理
student类

点击查看代码

package qixun;

public class student {
    private String stunumber;
    private String name;
    private int age;
    private boolean sex;
    private double score;

    public student(String stunumber,String name,int age,boolean sex,double score){
        this.stunumber=stunumber;
        this.name=name;
        this.age=age;
        this.sex=sex;
        this.score=score;
    }

    public String getStunumber(){
        return stunumber;
    }
    public void setStunumber(String stunumber){
        this.stunumber=stunumber;
    }
    public String getName(){
        return name;
    }
    public void setName(String name){
        this.name=name;
    }
    public int getAge(){
        return age;
    }
    public void setAge(int age){
        this.age=age;
    }
    public boolean getsex(){
        return sex;
    }
    public void setSex(boolean sex){
        this.sex=sex;
    }
    public double getScore(){
        return score;
    }
    public void setScore(double score){
        this.score=score;
    }
}

studentManage类

点击查看代码

package qixun;

import java.util.Scanner;

public class studentManage {
    public void Header(){
        System.out.println("***************************************************************\n");
        System.out.println("石家庄铁道大学软件工程系学生信息管理系统\n");
        System.out.println("****************************************************************\n");
    }
    public  void menu(){
        System.out.println("1、\t遍历输出学生信息；\n" +
                "2、\t新学生信息录入；\n" +
                "3、\t删除学生信息；\n" +
                "4、\t修改学生信息；\n" +
                "5、\t查询学生信息；\n" +
                "****************************************************************");
    }
    private student[] stds = new student[5];
    private int count=0;
    public void Menugo() {
        Scanner scanner = new Scanner(System.in);
        Header();
        while (true){
            menu();
            System.out.println("请选择：");
            int choice = scanner.nextInt();
            switch (choice){
                case 1:
                    showStdent();
                    break;
                case 2:
                    addStudent();
                    break;
                case 3:
                    deleteStudent();
                    break;
                case 4:
                    updateStudent();
                    break;
                case 5:
                    selectStudent();
                    break;
            }

        }
    }
    private void showStdent(){
        for(int i=0;i<count;i++){
            System.out.println("学号："+stds[i].getStunumber());
            System.out.println("姓名："+stds[i].getName());
            System.out.println("年零："+stds[i].getAge());
            System.out.println("性别："+stds[i].getsex());
            System.out.println("成绩："+stds[i].getScore());
            System.out.println("****************************************************************\n");
        }
    }

    private void addStudent(){
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学号：");
        String stunumber = scanner.nextLine();
        for(int i=0;i<count;i++) {
            if (stds[i].getStunumber().equals(stunumber)) {
                System.out.println("学号重复");
            }
        }
        System.out.println("请输入姓名：");
        String name = scanner.nextLine();
        System.out.println("请输入年龄：");
        int age = scanner.nextInt();
        System.out.println("请输入性别：");
        boolean sex = scanner.nextBoolean();
        System.out.println("请输入成绩：");
        double score = scanner.nextDouble();
        student newstudent=new student(stunumber,name,age,sex,score);
        stds[count]=newstudent;
        count++;
    }

    private void deleteStudent(){
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学号：");
        String stunumber = scanner.nextLine();
        boolean flag=false;
        for(int i=0;i<count;i++) {
            if(stds[i].getStunumber().equals(stunumber)) {
                for(int j=i;j+1<count;j++){
                    stds[j].setStunumber(stds[j+1].getStunumber());
                    stds[j].setName(stds[j+1].getName());
                    stds[j].setAge(stds[j+1].getAge());
                    stds[j].setSex(stds[j+1].getsex());
                    stds[j].setScore(stds[j+1].getScore());
                }
                count--;
                flag=true;
            }
        }
        if(flag==false){
            System.out.println("未找到");
        }
    }

    private void updateStudent(){
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学号：");
        String stunumber = scanner.nextLine();
        boolean flag=false;
        for(int i=0;i<count;i++){
            if(stds[i].getStunumber().equals(stunumber)){
                System.out.println("请选择修改内容：\n" +
                                   "1.学号 2.姓名 3.年龄 4.性别 5.成绩");
                int choice1 = scanner.nextInt();
                switch (choice1){
                    case 1:
                        System.out.println("请输入学号：");
                        String stunumber1 = scanner.nextLine();
                        stds[i].setStunumber(stunumber1);
                        break;
                    case 2:
                        System.out.println("请输入姓名：");
                        String name = scanner.nextLine();
                        stds[i].setName(name);
                        break;
                    case 3:
                        System.out.println("请输入年龄：");
                        int age = scanner.nextInt();
                        stds[i].setAge(age);
                        break;
                    case 4:
                        System.out.println("请输入性别：");
                        boolean sex = scanner.nextBoolean();
                        stds[i].setSex(sex);
                        break;
                    case 5:
                        System.out.println("请输入成绩：");
                        double score = scanner.nextDouble();
                        stds[i].setScore(score);
                        break;
                }
                flag=true;
            }
        }
        if(flag==false){
            System.out.println("未找到");
        }
    }

    private void selectStudent(){
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学号：");
        String stunumber = scanner.nextLine();
        for(int i=0;i<count;i++) {
            if(stds[i].getStunumber().equals(stunumber)){
                System.out.println("学号："+stds[i].getStunumber());
                System.out.println("姓名："+stds[i].getName());
                System.out.println("年零："+stds[i].getAge());
                System.out.println("性别："+stds[i].getsex());
                System.out.println("成绩："+stds[i].getScore());
                System.out.println("****************************************************************\n");
            }
        }
    }
    public static void main(String[] args) {
        studentManage management = new studentManage();
        management.Menugo();
    }
}