Java registration login study notes
Import java.util.Scanner
/ / user class
Class Users
{
String username
String password
Public Users (String username,String password) {
This.username = username
This.password = password
}
}
Public class LoginDome {
Users user
/ / determine the user name and password
Public boolean userLogin (String username,String password)
{
If (this.user.username.equals (username) & & this.user.password.equals (password))
{
Return true
}
Else
{
Return false
}
}
Public void setUser (Users user)
{
This.user = user
Public static void main (String [] args) {
String username
String password
Int iCount = 0; / / counter determines how many times to log in
Boolean flag = false;// to determine whether the login is successful or not
Scanner in = new Scanner (System.in)
System.out.println ("* user registration *")
System.out.println ("Please enter user name:")
Username = in.nextLine ()
System.out.println ("Please enter password:")
Password = in.nextLine ()
/ / keep the entered user and password
Users u = new Users (username,password)
LoginDome demo = new LoginDome ()
Demo.setUser (u)
System.out.println ("Registration successful!")
System.out.println ("* user login *")
Do {
System.out.println ("Please enter user name:")
Username = in.nextLine ()
System.out.println ("Please enter password:")
Password = in.nextLine ()
If (demo.userLogin (username,password)) / / call the method to determine whether the login is successful or not
{
Break
}
Else
{
ICount + +; / / number of records
If (iCount > = 3 & & flag = = false) / / if login fails more than 3 times
{
System.out.print ("if the login fails more than three times, the program will exit!")
System.exit (0)
}
Else
{
System.out.println ("Please check username and password")
}
}
} while (true)
}
}
* user registration *
Please enter a user name:
Liwen
Please enter your password:
123456
Registered successfully!
* user login *
Please enter a user name:
Li
Please enter your password:
two hundred and twenty two
Please check your user name and password
