java二维数组学生系统

下面是一个简单的Java二维数组学生系统，该系统可以实现添加、删除、修改和查询学生信息。

import java.util.Scanner;

public class StudentSystem {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String[][] students = new String[100][3]; // 二维数组存储学生信息，每个学生有三个属性：姓名、年龄、性别
        int count = 0; // 记录学生数量

        while (true) {
            System.out.println("请选择操作：");
            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. 查询学生");
            System.out.println("5. 退出系统");

            int choice = input.nextInt();

            switch (choice) {
                case 1:
                    System.out.print("请输入学生姓名：");
                    String name = input.next();
                    System.out.print("请输入学生年龄：");
                    String age = input.next();
                    System.out.print("请输入学生性别：");
                    String gender = input.next();
                    students[count][0] = name;
                    students[count][1] = age;
                    students[count][2] = gender;
                    System.out.println("添加学生成功！");
                    count++;
                    break;
                case 2:
                    System.out.print("请输入要删除的学生姓名：");
                    String deleteName = input.next();
                    int deleteIndex = -1; // 记录要删除的学生在数组中的索引
                    for (int i = 0; i < count; i++) {
                        if (deleteName.equals(students[i][0])) {
                            deleteIndex = i;
                            break;
                        }
                    }
                    if (deleteIndex == -1) {
                        System.out.println("没有找到该学生！");
                    } else {
                        for (int i = deleteIndex; i < count - 1; i++) {
                            students[i] = students[i + 1];
                        }
                        count--;
                        System.out.println("删除学生成功！");
                    }
                    break;
                case 3:
                    System.out.print("请输入要修改的学生姓名：");
                    String modifyName = input.next();
                    int modifyIndex = -1; // 记录要修改的学生在数组中的索引
                    for (int i = 0; i < count; i++) {
                        if (modifyName.equals(students[i][0])) {
                            modifyIndex = i;
                            break;
                        }
                    }
                    if (modifyIndex == -1) {
                        System.out.println("没有找到该学生！");
                    } else {
                        System.out.print("请输入新的学生姓名：");
                        String newName = input.next();
                        System.out.print("请输入新的学生年龄：");
                        String newAge = input.next();
                        System.out.print("请输入新的学生性别：");
                        String newGender = input.next();
                        students[modifyIndex][0] = newName;
                        students[modifyIndex][1] = newAge;
                        students[modifyIndex][2] = newGender;
                        System.out.println("修改学生成功！");
                    }
                    break;
                case 4:
                    System.out.print("请输入要查询的学生姓名：");
                    String searchName = input.next();
                    boolean found = false; // 标记是否找到该学生
                    for (int i = 0; i < count; i++) {
                        if (searchName.equals(students[i][0])) {
                            System.out.println("姓名：" + students[i][0] + "，年龄：" + students[i][1] + "，性别：" + students[i][2]);
                            found = true;
                            break;
                        }
                    }
                    if (!found) {
                        System.out.println("没有找到该学生！");
                    }
                    break;
                case 5:
                    System.out.println("退出系统！");
                    System.exit(0);
                    break;
                default:
                    System.out.println("输入有误，请重新输入！");
                    break;
            }
        }
    }
}