title: How do I receive input from a textbox in a JFrame?
body: <p>The following method extends a JFrame, but I need a swing textbox inside it to receive double values and store them in a variable. the textbox must be added to the container.  </p>
  
  <pre><code>    public class myClass extends JFrame{
          Container container;
          container = getContentPane();
  
          //Item label
          JLabel labelText = new JLabel();        
         ...
          labelText.setText ("Item:");        
          container.add( labelText );
  
          //Item name: Textbox
          //code to make a textbox, add it to the container, and store the value in a                      variable goes here
  </code></pre>