title: Freeze on JFrame while other is Open
body: <p>I have an application say two major GUIs (<code>College-JFrame</code> and <code>Department-JFrame</code>). There is <code>JButton</code> - <code>ManageDepartmentButton</code> - that opens the <code>Department-JFrame</code>. </p>
  
  <p>I want <code>College-JFrame</code> GUI to freeze or non-clickable when ever <code>Department-JFrame</code> is open.</p>
  
  <p>And after <code>Department-JFrame</code> is closed I want to restore / un-freeze the <code>College-JFrame</code>.</p>
  
  <p>Is there a way to do this? How? Or any work around?</p>