title: Calling another method java GUI
body: <p>I'm trying to make a GUI, and I can accomplish it all in one method, but I would like to make the code simpler and make multiple methods. However, I can't get it to work. I am new to Java programming. </p>
  
  <pre><code>public class Main {
      public static void main(String[] args) {
          FirstWindow fw = new FirstWindow();
  
          fw.setVisible(true);
          fw.setSize(600,400);
      }
  }
  
  public class FirstWindow extends JFrame {
  
      public FirstWindow() {
          checkbox c = new checkbox();
          c();
      }
  }
  
  
  public class checkbox extends JFrame {
  
      public checkbox() {
            //code
      }
  }
  </code></pre>