Java tutorial
import java.io.Console; import java.util.Arrays; public class Main { public static void main(String[] args) { Console console = System.console(); String username = console.readLine("Username: "); char[] password = console.readPassword("Password: "); if (username.equals("admin") && String.valueOf(password).equals("secret")) { console.printf("Welcome to Java Application %1$s.\n", username); Arrays.fill(password, ' '); } else { console.printf("Invalid username or password.\n"); } } }