Masking Password Input from the Console:Java

Masking password input from the console : Java

A full example ?. Run this code : (NB: This example is best run in the console and not from within an IDE, since the System.console() method might return null in that case.)

import java.io.Console;
public class Main {

    public void passwordExample() {        
        Console console = System.console();
        if (console == null) {
            System.out.println("Couldn't get Console instance");
            System.exit(0);
        }

        console.printf("Testing password%n");
        char[] passwordArray = console.readPassword("Enter your secret password: ");
        console.printf("Password entered was: %s%n", new String(passwordArray));

    }

    public static void main(String[] args) {
        new Main().passwordExample();
    }
}

Hide Password Input On Console Window

Use the Console readPassword() method:

 char[] passwd = System.console().readPassword("[%s]", "Password:");

Hide Password From Console Window Java Asterisk Password Or Block Inputted String Being Displayed

Use the readPassword() method.

instead of using scanner like

System.out.println("Please Enter Password");
    pass = sc.nextLine();

use:

    System.out.println("Please Enter Password");
    char[] passString = Console.readPassword();
    String pass = new String(passString );

How to encrypt the user input(for ex : password) in java output console

JDK provides Console class to handle these scenarios, it provides readPassword to read password by masking, it doesn't display *'s though.

Here is a small example.

import java.io.Console;
public class Library {
public static void main(String[] args) {
    Console console = System.console();
    char[] passwordArray = console.readPassword("Enter your password: ");
    console.printf("Password is: %s%n", new String(passwordArray));
}
}

Note: This only works with System's console, doesn't work with IDE.

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