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class BadPassword {
  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 IOException(""Invalid Credentials"");     
      }
      // ...
  }

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

class GoodPassword {
  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 IOException(""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;
  }
}

BufferedReader br = new BufferedReader(new InputStreamReader(
  new FileInputStream("file""file")));
// Read from the file

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