title: How to set jframe look and feel
body: <p>I am kind of confused on where to put this :</p>
  
  <pre><code>try {
      UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
      UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
  } catch(Exception e){
  
  }
  </code></pre>
  
  <p>I did not extend the <code>JFrame</code> class but used <code>JFrame f = new JFrame();</code>
  Thanks :D</p>