简单登录注册实现（Java面向对象复习）

 1  //用户类
 2 class Users{
 3 String username; //用户名
 4 String password; //密码
 5  
 6 Users(String username , String password){
 7 this.username = username ;
 8 this.password = password ;
 9  
10 }
11 }

 1 public class LoginDemo {
 2  
 3 Users user;
 4  
 5 //用户登录方法
 6 public boolean userLogin(String username , String password){
 7 if(this.user.username.equals(username)&&this.user.password.equals(password))
 8 {
 9 return true;
10 }else{
11 return false;
12 }
13 }
14  
15 public void setUser(Users user){
16 this.user = user;
17 }
18  
19 public static void main(String[] args) {
20  
21 String username; //用户名
22 String password; //密码
23 int iCount = 0;
24 boolean flag = false ;  //判断是否登录成功
25  
26 Scanner in = new Scanner(System.in);
27 System.out.println("*********用户注册***********");
28 System.out.println("请输入用户名：");
29 username = in.next();
30 System.out.println("请输入密码：");
31 password = in.next();
32  
33 Users u = new Users(username , password);
34 LoginDemo demo = new LoginDemo();
35  
36 demo.setUser(u);
37  
38 System.out.println("注册成功！");
39  
40 System.out.println("*********用户登录***********        ");
41  
42 do{
43 System.out.println("请输入用户名：");
44 username = in.next();
45 System.out.println("请输入密码：");
46 password = in.next();
47  
48 if(demo.userLogin(username, password)){
49 break;
50 }else{
51 iCount++;
52 if(iCount>=3 && flag == false){
53 System.out.println("登录失败次数超过三次，程序即将退出！");
54 System.exit(0);
55    }else{
56    System.out.println("请检查用户名或密码！");
57    }
58 }
59  
60 }while(true);
61            System.out.println("登录成功！");
62 }
63  
64 }