Java User name password validation sample code sharing _java

Class: Nameii Permissions: Public
Method: Main Permission: Public

Parameters: Name,password,denglu,i;
Parameter introduction:
Name, a data type String, used to store a value obtained from input and used as a repository for user names in this program;
Password, a data type String, used to store a value obtained from input, which is used as a store of passwords in this program;
Denglu, a Boolean of data type, used to store the login status of the default account, True indicates successful login, False indicates not yet logged in;
I, the data type int, is used to store a user to attempt the number of logon failures;

Method Features:
In the console output "Please enter user name:" Requires the user to enter a String value from the console to store in name;
Then in the console output "Please enter a password:" To require users to enter a String from the console stored in the password;
Verify that the user name and password obtained from the console through input are consistent with the default username and password;
If consistent, output "login succeeded" and change the user login status Denglu value to true;
If inconsistent, remind the user login failed, the user attempts to login failed to add 1, and remind users of the remaining number of attempts to login;
The number of unsuccessful attempts by the user to log on has reached 3 and prompted the user name account to be frozen.

Copy Code code as follows:

public class Nameii {
public static void Main (String []arge) {
Boolean Denglu = false;//declares a variable of a Boolean data type Denglu the login state that stores the user name, and the default value is False and is not logged in;
int i = 0;//declares an int data type variable I stores the number of times the user attempted to log on;
Java.util.Scanner input = new Java.util.Scanner (system.in);

do{
System.out.println ("Please enter user name:");
String name = Input.next ()//declares the variable name of a String data type to store the value of the user name obtained in input;
System.out.println ("Please enter password:");
string password = Input.next ()//declares a variable of a string data type password The value of the password obtained in the storage input;

Verify that the value in name and the value in password are consistent with the username and password;
if ("Zhang". Equals (name) && "123". Equals (password)) {//If consistent, execute the following block of code;
SYSTEM.OUT.PRINTLN ("Login succeeded");//Prompt user name login success;
Denglu = true;//change user name login status;
}else{//if inconsistent, execute the following block of code;

Remind the user to fail the login, add 1 times to the user's attempt to log in, and remind the user of the remaining attempts to log in;
i++;
SYSTEM.OUT.PRINTLN ("Login failed, you can also try" + (3-i) + "Times");

The number of unsuccessful user attempts to log in has reached 3 times and prompts the user name account to be frozen;
if (i = = 3) {
System.out.println ("Account or password error three times, account freezes");
}

}

}while (I < 3 &&!denglu), or users who have failed to attempt to login for less than three times or who have logged on successfully;
}
}