java登录注册小程序

import java.util.Scanner;
public class Miniprogram {
	public static String[][] arr = new String[5][2];
	public static int a = 1,number = 1;
	public static Scanner input = new Scanner(System.in);
	public static void main(String[] args) {
		// TODO Auto-generated method stub
	arr[0][0]="黑牛";arr[0][1]="1234";
	while(number == 1) {
		System.out.println("----heart000_1注册登录系统----");
		System.out.println("1.登录功能(login)");
		System.out.println("2.注册功能(register)");
		System.out.println("3.查看(show)");
		System.out.println("4.退出(exit)");
		System.out.println("----heart000_1注册登录系统----");
		System.out.println("请选择功能：");
		int choice = input.nextInt();
	switch (choice) {
		case 1:login();
				break;
		case 2:register();
				break;
		case 3:show();
				break;
		default:exit();
			break;
		}
	}
	}
	public static void login() {
		System.out.println("请输入用户名:");
		String user = input.next();
		System.out.println("请输入密码:");
		String password = input.next();
		for(int i = 1;i < arr.length;i++) {
			if(user.equals(arr[i][0]) && password.equals(arr[i][1])){
				System.out.println("登录成功！");
				break;
			}else if(i == arr.length-1){System.out.println("登录失败");}
		}
	}
	public static void register() {
		System.out.println("请输入用户名:");
		String user = input.next();
		System.out.println("请输入密码:");
		String password = input.next();
		arr[a][0] = user;
		arr[a][1] = password;
		System.out.println("注册成功!");
		a +=1;
	}
	public static void show() {
		for(int i = 0;i < a ;i++) {
			System.out.println("用户名:"+arr[i][0]+",t密码:"+arr[i][1]);
		}
	}
	public static void exit() {
		number = 0;
		System.out.println("退出成功!");
	}
}