Tiny problem with JOptionPane

I am a C++ programmer, and I'm trying to teach myself Java. According to my book, the following code should work:

import java.awt.*;
import javax.swing.*;

public class Test
{
      public void main(String[] args)
      {
            int a=0;
            System.out.println(getWord());
      }
      
      public String getWord()
      {
            return JOptionPane.showInputDialog(null "Please enter a word.",JOptionPane.QUESTION_MESSAGE);
      }
}

However, I get the following error:

Syntax error on token ""Please enter a word."", ")" expected

I'm sure I'm just overlooking a tiny thing... any help would be appreciated.