0
点赞
收藏
分享

微信扫一扫

简易的学生管理系统

荷一居茶生活 2022-02-20 阅读 26
import java.util.Scanner;
import java.util.ArrayList;

public class studentDemo {


    public static void main(String[] args) {
        ArrayList<student> array = new ArrayList<student>();
        Scanner sc = new Scanner(System.in);
        int i = 0;
        do {
            System.out.println("-------欢迎来到学生管理系统-------");
            System.out.println("1.添加学生");
            System.out.println("2.删除学生");
            System.out.println("3.修改学生");
            System.out.println("4.查看所有学生");
            System.out.println("5.退出");
            System.out.println("请输入你的选择:");
            i = sc.nextInt();
            if (i == 1) {
                toAdd(array);
            } else if (i == 2) {
                toRemove(array);
            } else if (i == 3) {
                toSet(array);
            } else if (i == 4) {
                toGet(array);
            }
            else if(i!=5){
                System.out.println("你输入的选择有误,请重新输入!!!");
            }

        }
        while (i != 5);
        System.out.println("谢谢使用!!!");
    }

    public static void toRemove(ArrayList<student> array) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入你要删除的学生的姓名:");
        String name = sc.nextLine();
        for (int i = 0; i < array.size(); i++) {
            student s = array.get(i);
            if (s.getName().equals(name)) {
                array.remove(i);
                System.out.println("删除学生信息成功!!!");
                return;
            }
        }
        System.out.println("查无此人,请重新输入信息!!!");
    }

    public static void toSet(ArrayList<student> array) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入你要修改学生信息的名字:");
        String name = sc.nextLine();
        for (int i = 0; i < array.size(); i++) {
            student s2 = array.get(i);
            if (s2.getName().equals(name)) {
                student s = new student();
                System.out.println("请输入你要修改的学生的新名字");
                s.setName(sc.nextLine());
                System.out.println("请输入你要修改的学生的新年龄:");
                s.setAge(sc.nextLine());
                System.out.println("请输入你要修改的学生的新学号:");
                s.setId(sc.nextLine());
                System.out.println("请输入你要修改的学生的新地址:");
                s.setDi(sc.nextLine());
                array.set(i, s);
                System.out.println("修改信息成功!!!");
                return;//直接结束此方法的运行
            }
        }
        System.out.println("查无此人,请重新输入信息!!!");
    }

    public static void toGet(ArrayList<student> array) {
        // toGet(array);
        //   \t:其实就是tab键的位置
        // 快捷键:ctrl+alt+l:格式化代码
        if (array.size() == 0) {
            System.out.println("无信息,请先添加信息再查询!!!");
            //这里后面也可以+ return;-----意思是结束
        } else {
            System.out.println("学生姓名\t学生年龄\t学生学号\t学生地址");
            for (int j = 0; j < array.size(); j++) {
                student s = new student();
                s = array.get(j);
                System.out.println(s.getName() + "\t" + s.getAge() + "岁\t" + s.getId() + "\t\t" + s.getDi());
            }
        }
    }

    public static void toAdd(ArrayList<student> array) {
        Scanner sc = new Scanner(System.in);
        student s = new student();
        String name;
        while (true) {
            System.out.println("请输入添加的学生的姓名:");
            name = sc.nextLine();
            boolean flag = isUsed(array, name);
            if (flag) {
                System.out.println("你输入的学生姓名已经被占用,请重新输入!!!");
            } else {
                break;
            }
        }
        System.out.println("请输入添加的学生的年龄:");
        String age = sc.nextLine();
        System.out.println("请输入添加的学生的学号:");
        String id = sc.nextLine();
        System.out.println("请输入添加的学生的地址:");
        String di = sc.nextLine();
        s.setName(name);
        s.setAge(age);
        s.setId(id);
        s.setDi(di);
        array.add(s);
        System.out.println("添加学生成功!!!");

    }

    public static boolean isUsed(ArrayList<student> array, String name) {
        boolean flag = false;
        for (int i = 0; i < array.size(); i++) {
            student s = array.get(i);
            if (s.getName().equals(name)) {
                flag = true;
                break;
            }
        }
        return flag;
    }
}
 class student {
    private String name;//名字
    private String age;//年龄
    private String id;//学号
    private String di;//地址

    public student() {
    }
//快捷键:alt+ins----可以快速构造方法

    public student(String name, String age, String id, String di) {
        this.name = name;
        this.age = age;
        this.id = id;
        this.di = di;
    }

    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 getDi() {
        return di;
    }

    public void setDi(String di) {
        this.di = di;
    }
}
举报

相关推荐

0 条评论