Java--A simple student management system implemented with a pair of arrays

The author has been reviewing Java knowledge these days, and wanted to deepen the basic content, so he started to operate the student management system that he developed when he first started. He specially shared the code with everyone, and it can be used as a reference if needed.

import java.util.Scanner;public class StudentManagementSystem {    public static void main(String[] args) {        // 做一个学员信息管理系统，目前仅支持以<姓名>的方式对学员信息进行管理(增删改查)，即管理只是学员的姓名信息
        Scanner scanner = new Scanner(System.in);
        boolean flage = true;        while (flage) {
            System.out.println("请选择需要操作的功能：\n1-添加\t2-删除\t3-修改\t4-查询\t5-退出");            int num = scanner.nextInt();            switch (num) {            case 1:
                System.out.println("请输入需要添加的名字：");
                name = scanner.next();                bool = add(name);                if (bool) {
                    System.out.println("添加成功");
                } else {
                    System.out.println("添加失败");
                }                break;            case 2:
                System.out.println("请输入需要删除的名字：");
                String name = scanner.next();                bool = delete(name);                if (bool) {
                    System.out.println("删除成功");
                } else {
                    System.out.println("删除失败");
                }                break;            case 3:
                System.out.println("请输入需要修改的名字：");
                name = scanner.next();
                System.out.println("请输入修改后的名字");
                String newName = scanner.next();                bool = update(name, newName);                if (bool) {
                    System.out.println("修改成功");
                } else {
                    System.out.println("修改失败");
                }                break;            case 4:
                print();                break;            case 5:
                System.out.println("欢迎下次使用，再见！");
                flage = false;                break;            default:
                System.out.println("选择错误，请重新输入");                break;
            }
        }
        scanner.close();
    }    public static String name;    public static boolean bool;    public static String[] names = new String[3];    public static int point = 0;    // 添加
    public static boolean add(String name) {        // 判断合法性
        if (!isOk(name)) {            return false;
        }        // 判断是否存在
        if (query(name) != -1) {
            System.out.println("姓名已存在");            return false;
        }        // 扩容
        if (point == names.length) {
            addCapacity();
        }        // 添加
        names[point] = name;
        point++;        return true;
    }    // 删除
    public static boolean delete(String name) {        // 判断合法性
        if (!isOk(name)) {            return false;
        }        // 判断是否存在
        int index = query(name);        if (index == -1) {
            System.out.println("姓名不存在");            return false;
        }        // 删除
        for (int i = index; i < point; i++) {
            names[i] = names[i + 1];
        }
        point--;        return true;
    }    // 修改
    public static boolean update(String name, String newName) {        if (!isOk(name) || !isOk(newName)) {            return false;
        }        // 判断是否存在
        int index = query(name);        if (index == -1) {
            System.out.println("姓名不存在");            return false;
        }        if (query(newName) != -1) {
            System.out.println("姓名已存在");            return false;
        }        // 修改
        names[index] = newName;        return true;
    }    // 查询
    public static int query(String name) {        for (int i = 0; i < point; i++) {            if (names[i].equals(name)) {                return i;
            }
        }        return -1;
    }    // 判断合法性
    public static boolean isOk(String name) {        if (name.length() < 2 || name.length() > 8) {
            System.out.println("姓名不合法");            return false;
        }        return true;
    }    // 扩容
    public static void addCapacity() {
        String[] newNames = new String[names.length * 2];        for (int i = 0; i < names.length; i++) {
            newNames[i] = names[i];
        }
        names = newNames;
    }    // 打印
    public static void print() {        for (int i = 0; i < point; i++) {
            System.out.println(names[i]);
        }
    }
}

import java.util.Scanner;public class StudentManagementSystem {    public static void main(String[] args) {        // 做一个学员信息管理系统，目前仅支持以<姓名>的方式对学员信息进行管理(增删改查)，即管理只是学员的姓名信息
        Scanner scanner = new Scanner(System.in);
        boolean flage = true;        while (flage) {
            System.out.println("请选择需要操作的功能：\n1-添加\t2-删除\t3-修改\t4-查询\t5-退出");            int num = scanner.nextInt();            switch (num) {            case 1:
                System.out.println("请输入需要添加的名字：");
                name = scanner.next();                bool = add(name);                if (bool) {
                    System.out.println("添加成功");
                } else {
                    System.out.println("添加失败");
                }                break;            case 2:
                System.out.println("请输入需要删除的名字：");
                String name = scanner.next();                bool = delete(name);                if (bool) {
                    System.out.println("删除成功");
                } else {
                    System.out.println("删除失败");
                }                break;            case 3:
                System.out.println("请输入需要修改的名字：");
                name = scanner.next();
                System.out.println("请输入修改后的名字");
                String newName = scanner.next();                bool = update(name, newName);                if (bool) {
                    System.out.println("修改成功");
                } else {
                    System.out.println("修改失败");
                }                break;            case 4:
                print();                break;            case 5:
                System.out.println("欢迎下次使用，再见！");
                flage = false;                break;            default:
                System.out.println("选择错误，请重新输入");                break;
            }
        }
        scanner.close();
    }    public static String name;    public static boolean bool;    public static String[] names = new String[3];    public static int point = 0;    // 添加
    public static boolean add(String name) {        // 判断合法性
        if (!isOk(name)) {            return false;
        }        // 判断是否存在
        if (query(name) != -1) {
            System.out.println("姓名已存在");            return false;
        }        // 扩容
        if (point == names.length) {
            addCapacity();
        }        // 添加
        names[point] = name;
        point++;        return true;
    }    // 删除
    public static boolean delete(String name) {        // 判断合法性
        if (!isOk(name)) {            return false;
        }        // 判断是否存在
        int index = query(name);        if (index == -1) {
            System.out.println("姓名不存在");            return false;
        }        // 删除
        for (int i = index; i < point; i++) {
            names[i] = names[i + 1];
        }
        point--;        return true;
    }    // 修改
    public static boolean update(String name, String newName) {        if (!isOk(name) || !isOk(newName)) {            return false;
        }        // 判断是否存在
        int index = query(name);        if (index == -1) {
            System.out.println("姓名不存在");            return false;
        }        if (query(newName) != -1) {
            System.out.println("姓名已存在");            return false;
        }        // 修改
        names[index] = newName;        return true;
    }    // 查询
    public static int query(String name) {        for (int i = 0; i < point; i++) {            if (names[i].equals(name)) {                return i;
            }
        }        return -1;
    }    // 判断合法性
    public static boolean isOk(String name) {        if (name.length() < 2 || name.length() > 8) {
            System.out.println("姓名不合法");            return false;
        }        return true;
    }    // 扩容
    public static void addCapacity() {
        String[] newNames = new String[names.length * 2];        for (int i = 0; i < names.length; i++) {
            newNames[i] = names[i];
        }
        names = newNames;
    }    // 打印
    public static void print() {        for (int i = 0; i < point; i++) {
            System.out.println(names[i]);
        }
    }
}

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