java使用数组完成学生姓名的增删改查

下面是使用Java数组完成学生姓名的增删改查的示例代码：

import java.util.Scanner;

public class StudentManagementSystem {
    private static String[] students = new String[100];  // 保存学生姓名的数组
    private static int numStudents = 0;  // 学生数量

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("请选择要执行的操作：");
            System.out.println("1. 添加学生姓名");
            System.out.println("2. 删除学生姓名");
            System.out.println("3. 修改学生姓名");
            System.out.println("4. 查询学生姓名");
            System.out.println("5. 退出程序");

            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    addStudent(scanner);
                    break;
                case 2:
                    deleteStudent(scanner);
                    break;
                case 3:
                    modifyStudent(scanner);
                    break;
                case 4:
                    queryStudent(scanner);
                    break;
                case 5:
                    System.exit(0);
                default:
                    System.out.println("无效的选项，请重新输入！");
                    break;
            }
        }
    }

    // 添加学生姓名
    private static void addStudent(Scanner scanner) {
        if (numStudents >= students.length) {
            System.out.println("添加失败，学生数量已达到最大值！");
            return;
        }

        System.out.println("请输入要添加的学生姓名：");
        String name = scanner.next();

        students[numStudents++] = name;

        System.out.println("添加成功！");
    }

    // 删除学生姓名
    private static void deleteStudent(Scanner scanner) {
        System.out.println("请输入要删除的学生姓名：");
        String name = scanner.next();

        int index = findStudent(name);

        if (index == -1) {
            System.out.println("删除失败，未找到指定学生姓名！");
            return;
        }

        for (int i = index; i < numStudents - 1; i++) {
            students[i] = students[i + 1];
        }

        numStudents--;

        System.out.println("删除成功！");
    }

    // 修改学生姓名
    private static void modifyStudent(Scanner scanner) {
        System.out.println("请输入要修改的学生姓名：");
        String oldName = scanner.next();

        int index = findStudent(oldName);

        if (index == -1) {
            System.out.println("修改失败，未找到指定学生姓名！");
            return;
        }

        System.out.println("请输入新的学生姓名：");
        String newName = scanner.next();

        students[index] = newName;

        System.out.println("修改成功！");
    }

    // 查询学生姓名
    private static void queryStudent(Scanner scanner) {
        System.out.println("请输入要查询的学生姓名：");
        String name = scanner.next();

        int index = findStudent(name);

        if (index == -1) {
            System.out.println("查询失败，未找到指定学生姓名！");
            return;
        }

        System.out.println("查询结果：");
        System.out.println(students[index]);
    }

    // 查找学生姓名
    private static int findStudent(String name) {
        for (int i = 0; i < numStudents; i++) {
            if (students[i].equals(name)) {
                return i;
            }
        }

        return -1;
    }
}

在上面的代码