Creating a Borderless Window

 
 JWindow window = new JWindow();
     
 // Add component to the window.
 // The next two lines should be in one line.
 window.getContentPane().add(component, 
   BorderLayout.CENTER);
     
 // Set initial size.
 window.setSize(300, 300);
     
 // Show the window.
 window.setVisible(true);