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class Password {
  public static void main (String args[]) throws IOException {
    Console c = System.console();
    
    if (c == null) {
      System.err.println("No console.");
      System.exit(1);
    }

    String username = c.readLine("Enter your user name: ");
    char[] password = c.readPassword("Enter your password: ");
    boolean isValidUser = verify(username, password); 

    // Clear the password
    Arrays.fill(password,' ');
    password = null;
    System.gc();

    if (!isValidUser) {
      throw new SecurityException("Invalid Credentials"); 
    }

    // User is authorized, continue...
  }

  // Dummy verify method, always returns true   
  private static final boolean verify(String username, char[] password) {
    return true;
  }
}