java 学生管理系统（案例）25

package com.demo.studer;

public class stu {
    private String id;
    private String name;
    private int age;
    private String birthday;

    public stu() {
    }

    public stu(String id, String name, int age, String birthday) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.birthday = birthday;
    }

    /**
     * 获取
     * @return id
     */
    public String getId() {
        return id;
    }

    /**
     * 设置
     * @param id
     */
    public void setId(String id) {
        this.id = id;
    }

    /**
     * 获取
     * @return name
     */
    public String getName() {
        return name;
    }

    /**
     * 设置
     * @param name
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * 获取
     * @return age
     */
    public int getAge() {
        return age;
    }

    /**
     * 设置
     * @param age
     */
    public void setAge(int age) {
        this.age = age;
    }

    /**
     * 获取
     * @return birthday
     */
    public String getBirthday() {
        return birthday;
    }

    /**
     * 设置
     * @param birthday
     */
    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }

    public String toString() {
        return "stu{id = " + id + ", name = " + name + ", age = " + age + ", birthday = " + birthday + "}";
    }
}

package com.demo.studer;

import java.util.ArrayList;

public class dame {
    public static void main(String[] args) {
        ArrayList<stu> list = new ArrayList<>();

        stu list1 = new stu("23", "张三", 26, "1999");
        stu list2 = new stu("24", "李四", 26, "1999");
        stu list3 = new stu("25", "王五", 26, "1999");
        list.add(list1);
        list.add(list2);
        list.add(list3);

        String id = "25";
        int index = getIndex(id, list);
        System.out.println(index);
    }

    private static int getIndex(String id, ArrayList<stu> list) {
        for (int i = 0; i < list.size(); i++) {
            stu stu = list.get(i);
            if (stu.getId().equals(id)){
                return i;
            }
        }
        return -1;
    }


}

package com.demo.studer;

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

public class SysTem {
    public static void main(String[] args) {
        ArrayList<stu> list = new ArrayList<>();
        Scanner sc = new Scanner(System.in);
        stu list1 = new stu("1", "张三", 26, "1999");
        stu list2 = new stu("2", "李四", 26, "1999");
        stu list3 = new stu("3", "王五", 26, "1999");
        list.add(list1);
        list.add(list2);
        list.add(list3);
        while (true) {
            System.out.println("学生管理系统");
            System.out.println("1.添加学生");
            System.out.println("2.修改学生");
            System.out.println("3.删除学生");
            System.out.println("4.查询学生");
            System.out.println("5.退出");
            int modify = sc.nextInt();
            switch (modify) {
                case 1:
                    Addlist(list);
                    break;
                case 2:
                    setList(list);
                    break;
                case 3:
                    removeList(list);
                    break;
                case 4:
                    getList(list);
                    break;
                case 5:
                    System.out.println("退出");
                    System.exit(0);
                    break;
                default:
                    System.out.println("您的输入有误");
                    break;
            }
        }

    }

    //删除学生信息
    private static void removeList(ArrayList<stu> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入您要删除的学生学号：");
        String id = sc.nextLine();
        int index = getIndex(id, list);
        if (index == -1) {
            System.out.println("没有该学生信息");
            return;
        } else {
            list.remove(index);
            System.out.println("删除成功");

        }
    }


    private static void setList(ArrayList<stu> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入您要修改的学生学号：");
        String updateId = sc.nextLine();
        int index = getIndex(updateId, list);
        if (index == -1) {
            System.out.println("没有该学生信息");
            return;
        } else {
            System.out.println("请输入新的学生名字：");
            String name = sc.next();
            System.out.println("请输入新的学生年龄：");
            int age = sc.nextInt();
            System.out.println("请输入新的学生生日：");
            String birthday = sc.next();
            stu stu = new stu(updateId, name, age, birthday);
            list.set(index, stu);
        }

    }

    //  查询学生
    private static void getList(ArrayList<stu> list) {
        if (list.size() == 0) {
            System.out.println("查无信息!");
        } else {
            System.out.println("学号\t\t\t姓名\t年龄\t生日");
            for (int i = 0; i < list.size(); i++) {
                stu s = list.get(i);
                System.out.println("学号" + s.getId() + "姓名" + s.getName() + "年龄" + s.getAge() + "生日" + s.getBirthday());
            }
        }
    }

    //添加学生信息
    private static void Addlist(ArrayList<stu> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入新的学生编号：");

        String id = "";
        while (true) {
            id = sc.next();
            int index = getIndex(id, list);
            if (index == -1) {
                break;
            } else {
                System.out.println("您输入的学号已被占用，请重新输入：");
            }
        }
        System.out.println("请输入新的学生名字：");
        String name = sc.next();
        System.out.println("请输入新的学生年龄：");
        int age = sc.nextInt();
        System.out.println("请输入新的学生生日：");
        String birthday = sc.next();
        stu stu = new stu(id, name, age, birthday);
        list.add(stu);
        System.out.println("添加成功");
    }

    //    根据索引查询学生信息
    private static int getIndex(String id, ArrayList<stu> list) {
        for (int i = 0; i < list.size(); i++) {
            stu stu = list.get(i);
            if (stu.getId().equals(id)) {
                return i;
            }
        }
        return -1;
    }

}