Need Help: Simple Java Script won't Compile

Hey all. I've been messing around with JAVA for a few days and I have this small script I that I cannot get to compile. Any help is much appreciated.

//UpperToLower

import javax.swing.JOptionPane;

public class UpperToLowerDalziel
{
  public static void main(String[] args)
  {
    char chUpper, chLower;

    while (true)
     {

    String dataString = JOptionPane.showInputDialog(null, "Enter Uppercase Character: Enter # to Quit", JOptionPane.QUESTION_MESSAGE);

    chUpper = dataString.charAt(0); // Get the first character in string

    chLower = upperCaseToLowerCase(chUpper);

    String output = "Uppercase " + chUpper + " is " + " Lowercase " + chLower; JOptionPane.showMessageDialog(null, output, "Upper To Lower", JOptionPane.INFORMATION_MESSAGE);

    if (chLower == '#') break;
    }
  }

public static char upperCaseToLowerCase(char ch)
  {
  int offset = 32;

  if (ch >= 'A' && ch <= 'z');

  return (char)(ch + offset);

  return ch; <----ERROR

  }
} // End of script

Code (markup):

 

This forum is related to javascript, not java.
Anyway, can you post the error message you're getting ?
Also you should replace if (ch >= 'A' && ch <= 'z'); with if (ch >= 'A' && ch <= 'Z');
('Z' should be uppercase, not lowercase).