java使用二维数组存储学生姓名，性别，班级，电话号码等信息，并实现增删改查

好的，这是一个比较常见的Java面试题，下面是示例代码：

import java.util.Scanner;

public class StudentInfo {
    private String[][] students;

    public StudentInfo(int rows, int cols) {
        students = new String[rows][cols];
    }

    public void addStudent(int index, String name, String gender, String className, String phoneNumber) {
        students[index][0] = name;
        students[index][1] = gender;
        students[index][2] = className;
        students[index][3] = phoneNumber;
    }

    public void removeStudent(int index) {
        students[index] = null;
    }

    public void updateStudent(int index, String name, String gender, String className, String phoneNumber) {
        students[index][0] = name;
        students[index][1] = gender;
        students[index][2] = className;
        students[index][3] = phoneNumber;
    }

    public String[] searchStudent(String name) {
        for (int i = 0; i < students.length; i++) {
            if (students[i][0].equals(name)) {
                return students[i];
            }
        }
        return null;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学生人数：");
        int rows = scanner.nextInt();
        int cols = 4;
        StudentInfo studentInfo = new StudentInfo(rows, cols);

        for (int i = 0; i < rows; i++) {
            System.out.println("请输入学生信息：姓名、性别、班级、电话号码，中间用空格分隔");
            String name = scanner.next();
            String gender = scanner.next();
            String className = scanner.next();
            String phoneNumber = scanner.next();
            studentInfo.addStudent(i, name, gender, className, phoneNumber);
        }

        System.out.println("学生信息录入完毕");

        while (true) {
            System.out.println("请选择操作：1. 查询学生信息 2. 修改学生信息 3. 删除学生信息 4. 退出程序");
            int option = scanner.nextInt();

            switch (option) {
                case 1:
                    System.out.println("请输入要查询的学生姓名：");
                    String name = scanner.next();
                    String[] student = studentInfo.searchStudent(name);
                    if (student != null) {
                        System.out.println("查询结果如下：");
                        System.out.println("姓名：" + student[0] + " 性别：" + student[1] + " 班级：" + student[2] + " 电话号码：" + student[3]);
                    } else {
                        System.out.println("没有找到该学生的信息");
                    }
                    break;
                case 2:
                    System.out.println("请输入要修改的学生姓名：");
                    name = scanner.next();
                    student = studentInfo.searchStudent(name);
                    if (student != null) {
                        System.out.println("请输入修改后的学生信息：姓名、性别、班级、电话号码，中间用空格分隔");
                        String newName = scanner.next();
                        String newGender = scanner.next();
                        String newClassName = scanner.next();
                        String newPhoneNumber = scanner.next();
                        studentInfo.updateStudent(Integer.parseInt(student[0]), newName, newGender, newClassName, newPhoneNumber);
                        System.out.println("学生信息修改成功");
                    } else {
                        System.out.println("没有找到该学生的信息");
                    }
                    break;
                case 3:
                    System.out.println("请输入要删除的学生姓名：");
                    name = scanner.next();
                    student = studentInfo.searchStudent(name);
                    if (student != null) {
                        studentInfo.removeStudent(Integer.parseInt(student[0]));
                        System.out.println("学生信息删除成功");
                    } else {
                        System.out.println("没有找到该学生的信息");
                    }
                    break;
                case 4:
                    System.out.println("程序已退出");
                    System.exit(0);
                    break;
                default:
                    System.out.println("无效的选项，请重新输入");
                    break;
            }
        }
    }
}

这个程序使用二维数组存储学生信息，其中第一维表示学生的索引，第二维包含四个元素，分别是学生的姓名、性别、班级和电话号码。程序提供了增加、删除、修改和查询学生信息的功能，可以通过用户输入选择要执行的操作。