title: How to add components to JDialog
body: <pre><code>   d1=new JDialog();
     d1.setSize(200, 100);
     t1=new JTextField();
     t1.setBounds(10,10,40,20);
     d1.add(t1);
  </code></pre>
  
  <p>I want to add components in JDialog such as TextField, Button...    </p>