title: Java - How to make contents of JFrame appear in the same Window instead of multiple windows
body: <p>I am new to java and am getting to the advanced level of it, i have a problem in the GUI Controls, i made a button that when clicked opens up a new window like this: </p>
  
  <pre><code>     JButton b = new JButton("Open New Window");
       b.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent e) {
       Window w = new Window();
       w.setVisible(true);
       }
       });
  </code></pre>
  
  <p>this window contains other objects but i have been thinking of making the button in such a way that instead of opening a new JFrame, it opens everything in that same window without opening a new window, honestly i dont know how to do so please could i get some professional help</p>