java基础巩固综合训练(学生信息管理系统 增、删、查、改)

• 这个系统设对初学者用处蛮大的，如果初学者正好是学到了面向对象，只要这个题能看懂做出来，就相当于学的不错。然后有不懂的可以在下方评论，我会为你们一一解答。

package studentManage01.studentManage;
/*
        学生类
* */
public class Student {
    private String name;
    private String age;
    private String id;
    private String address;

    public Student() {
    }

    public Student(String name, String age, String id, String address) {
        this.name = name;
        this.age = age;
        this.id = id;
        this.address = address;//地址
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}

1. 实现类

package studentManage01.studentManage;

import java.util.ArrayList;
import java.util.Scanner;

/*
        测试类
* */
public class studentInfoTest {
    public static void main(String[] args) {
        ArrayList<Student> arr = new ArrayList<>();
        Scanner sc = new Scanner(System.in);
        int i1 = 0;//计数
        while (true) {
            i1++;
            System.out.println("--------学生信息管理系统--------");
            System.out.println("1.增加学生信息");
            System.out.println("2.删除学生信息");
            System.out.println("3.修改学生信息");
            System.out.println("4.查看所有学生信息");
            System.out.println("5.退出");
            System.out.println("请输入选项");
            int i = sc.nextInt();
            switch (i) {
                case 1:
                    //System.out.println("增加学生信息");
                    zengjia(arr);
                    break;
                case 2:
                    //System.out.println("删除学生信息");
                    shanchu(arr);
                    break;
                case 3:
                    //System.out.println("修改学生信息");
                    xiugai(arr);
                    break;
                case 4:
                    //System.out.println("查看学生信息");
                    chakan(arr);
                    break;
                case 5:
                    System.out.println("谢谢使用");
                    return;
                default:
                    if (i1 == 1) {
                        System.out.println("你输入错误,请重新运行输入");
                        return;
                    } else {
                        System.out.println("客官不可以这样,请重新选着");
                    }

            }
        }
    }

    //增加学生信息
    public static void zengjia(ArrayList<Student> arr) {
        Scanner sc = new Scanner(System.in);
        String id;
        while (true) {
            System.out.println("请输入要增加的学生学号");
             id = sc.next();
            boolean b = judgs(arr, id);
            if (b) {
                System.out.println("增加的学生已经存在,请重新输入");
            } else{
                break;
            }
        }
        /*for (int i = 0; i < arr.size(); i++) {
            Student s = arr.get(i);
            if(s.getId().equals(id)){
                System.out.println("增加的学生已经存在,请重新选着");
                return;
            }
        }*/
        System.out.println("请输入要增加的学生姓名");
        String name = sc.next();
        System.out.println("请输入要增加的学生年龄");
        String age = sc.next();
        System.out.println("请输入你要增加的学生地址");
        String address = sc.next();
        Student s = new Student();
        s.setId(id);
        s.setName(name);
        s.setAge(age);
        s.setAddress(address);
        arr.add(s);
        System.out.println("录入成功");

    }

    //查看学生信息
    public static void chakan(ArrayList<Student> arr) {
        if (arr.size() == 0) {
            System.out.println("无学生信息,请先添加再查看");
            return;
        }
        System.out.println("学号:" + "\t" + "姓名:" + "\t" + "年龄:" + "\t" + "地址:");
        for (int i = 0; i < arr.size(); i++) {
            Student s = arr.get(i);
            System.out.println(s.getId() + "\t" + s.getName() + "\t\t" + s.getAge() + "\t\t" + s.getAddress());
        }
    }

    //删除学生信息
    public static void shanchu(ArrayList<Student> arr) {
        //Student stu = new Student();
        if (arr.size() == 0) {
            System.out.println("没有添加学生信息,请先添加再删除");
            return;
        }
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要删除的学生学号");
        String id = sc.next();
        for (int i = 0; i < arr.size(); i++) {
            Student s = arr.get(i);
            if (s.getId().equals(id)) {
                arr.remove(i);
                return;
            }
        }
        System.out.println("删除失败,没有该学号");
    }

    //修改学生的信息
    public static void xiugai(ArrayList<Student> arr) {
        Scanner sc = new Scanner(System.in);
        Student stu = new Student();
        if(arr.size()==0){
            System.out.println("先录入在修改");
        }
        System.out.println("请输入要修改的学生学号");
        String id = sc.next();
        for (int i = 0; i < arr.size(); i++) {
            Student s = arr.get(i);
            if(s.getId().equals(id)){
                System.out.println("请输入要修改的学生姓名");
                String name = sc.next();
                System.out.println("请输入要修改的学生年龄");
                String age = sc.next();
                System.out.println("请输入要修改的学生地址");
                String address = sc.next();
                stu.setId(id);
                stu.setName(name);
                stu.setAge(age);
                stu.setAddress(address);
                arr.set(i,stu);
                return ;
            }
        }
        System.out.println("修改失败");
    }
    //判断学生的id是否重复
    public static boolean judgs(ArrayList<Student> arr ,String sid){
        boolean b = false;
        for (int i = 0; i < arr.size(); i++) {
            Student s = arr.get(i);
            if(s.getId().equals(sid)){
               b  = true;
               break;
            }
        }
        return b;
    }
}