Java小練習之利用面向對象寫一個簡單的登錄系統

import java.util.Scanner;
/**
 * 采用面向對象的方式 寫一個登錄系統
 * @author Administrator
 *
 */

//用戶信息
class UserInfo{
	public static String[] user = new String[10];
	public static String[] passwd = new String[10];
	
	public UserInfo() {
		this.user[0] = "test";
		this.passwd[0] ="123456";
		
	}
	
}

//找回密碼
class ZhaoHui extends UserInfo{
	public static void zhaohui() {
		Scanner s = new Scanner(System.in);
		System.out.println("請輸入你要找回的用戶名：");
		String zname = s.nextLine();
		for(int i=0;i<2;i++) {
			if(user[i].equals(zname)) {
				Scanner ss = new Scanner(System.in);
				System.out.println("恭喜你!成功找回密碼，請輸入："+"'張哥最帥'"+"  查看密碼");
				String zgzs = ss.nextLine();
				
				if("張哥最帥".equals(zgzs)) {
					System.out.println(passwd[i]);
				}else {
					System.out.println("請輸正確！");
				}		
			}else if(user[i]!=zname){
				System.out.println("用戶名不存在！");
				return;
			}	
			break;
		}
	}
}
//修改密碼 
class XiuGai extends UserInfo{
	public static void xiugai() {
		
		Scanner s =new Scanner(System.in);
		System.out.println("請輸入您要修改的密碼：");
		String xpasswd = s.nextLine();
		for(int i=0;i<2;i++) {
			passwd[i] = xpasswd;
			if(xpasswd.equals(passwd[i])) {
				System.out.println("恭喜你，修改成功！");
				break;
			}else {
				System.out.println("修改密碼失敗");
				break;
			}
		}
	}
}

//查詢用戶
class ChaXun extends UserInfo{
	
	public static void select() {
		for(int i=0;i<2;i++) {
			System.out.println("當前用戶："+user[i] +"\n"+ "當前密碼："+passwd[i] );
			i++;
			break;
		}
	}
}
//注冊
class ZhuCe extends UserInfo{
	
	public static void regist() {
		Scanner ss = new Scanner(System.in);
		System.out.println("請輸入用戶名：");
		String suser = ss.nextLine();
		System.out.println("請輸入密碼：");
		String spasswd = ss.nextLine();
	
		for(int i=0;i<user.length;i++) {
		
				user[i] = suser;
				passwd[i] = spasswd;
				System.out.println("注冊成功!");
				break;
		
		}
	}
}

//登錄
class Loginc extends UserInfo{
	
	public static void login() {
		int flag = 1;
		Scanner scanner = new Scanner(System.in);
		System.out.println("請輸入用戶名：");
		String users = scanner.nextLine();
		System.out.println("請輸入密碼：");
		String passwds = scanner.nextLine();
		
		for(int i=0;i<UserInfo.user.length;i++) {
			if(user[i].equals(users) && passwd[i].equals(passwds)) {
				System.out.println("登陸成功！");
				break;
			}
			System.out.println("登陸失敗！");
			break;
		}
		
	}
}


//主界面
class ZhuJieMian{
	public static void Start() {
		Loginc Loginc = new Loginc();
		ZhuCe ZhuCe = new ZhuCe();
		ChaXun ChaXun = new ChaXun();
		XiuGai XiuGai = new XiuGai();
		ZhaoHui ZhaoHui = new ZhaoHui();
		
		Scanner s = new Scanner(System.in);
		while(true) {
			System.out.println("|"+ "\t"+ "\t"+ "\t"+ "\t"+ "\t"+ "\t"+ "\t"+"\t"+"|");
			System.out.println("|"+"\t" + "測試用戶名:test 測試密碼:123456" + "\t"+ "\t"+ "\t"+ "\t"+"|");
			System.out.println("|" + "\t"+ "請輸入[1-5]進行操作 1.登錄|2.注冊|3.查詢當前用戶|4.修改密碼|5.找回密碼 " + "\t"+"|");
			System.out.print("請輸入:");
			int temp = s.nextInt();
		
			switch(temp) {
			case 1:Loginc.login();
			break;
			case 2:ZhuCe.regist();;
			break;
			case 3:ChaXun.select();;
			break;
			case 4:XiuGai.xiugai();;
			break;
			case 5:ZhaoHui.zhaohui();;
			break;
			default:System.out.println("錯誤！請重寫輸入正確的數字進行操作！");
		
			}
		}
	}
	
}

public class LoginTest {
	public static void main(String[] args) {
		ZhuJieMian zjm = new ZhuJieMian();
		zjm.Start();
		
		
	}
	
}

運行結果：