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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 login = c.readLine("Enter your user name: ");
      String password = c.readLine("Enter your password: ");

      if (!verify(login, password)) {
        throw new IOExceptionSecurityException("Invalid Credentials");     
      }
      // ...
  }

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

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 login = c.readLine("Enter your user name: ");
    char [] password = c.readPassword("Enter your password: ");
  
    if (!verify(login, password)) {
      throw new IOExceptionSecurityException("Invalid Credentials");     
    }
  
    // Clear the password
    Arrays.fill(password, ' ');
  }

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

private void readIntoDirectBuffer() throws IOException {
  ByteBuffer buffer = ByteBuffer.allocateDirect(16 * 1024);
  FileChannel rdr = null;
  try {
    rdr = (new FileInputStream("file")).getChannel();
    while (rdr.read(buffer) > 0) {
      // Do something with the buffer
      buffer.clear();
    }
  } finally { 
    rdr.close();
  }
}