Can u describe what is happening in highlighted area?

public class FreeSpaceFrame extends JFrame f public FreeSpaceFrame ) super ("Disk Free Space") setLookAndFeel); setsize(500, 120) setDefaultCloseoperation (JFrame.EXIT ON_CLOSE); FlowLayout flo new FlowLayout(); setLayout (flo); FreeSpacePanel freePanelnew FreeSpacePanel) add(freePanel); setvisible(true) private void setLookAndFeel) try f UIManager.SetLookAndFeel( "javax.swing.plaf.nimbus.nimbusLookAndFeel" ) catch (Exception exc) // ignore error public static void main(String arguments) FreeSpaceFrame framenew FreeSpaceFrame)i Disk Free Space Disk Space: 510513745920 free out of 1000240963584 (51.03%)