ComponentEvent.COMPONENT_LAST has the following syntax.
public static final int COMPONENT_LAST
In the following code shows how to use ComponentEvent.COMPONENT_LAST field.
import java.awt.event.ComponentEvent; import java.awt.event.ComponentListener; /*from w ww .j a v a 2 s .co m*/ import javax.swing.JFrame; public class Main implements ComponentListener { @Override public void componentShown(ComponentEvent evt) { System.out.println(evt.getID()== ComponentEvent.COMPONENT_LAST); } @Override public void componentResized(ComponentEvent e) { } @Override public void componentMoved(ComponentEvent e) { } @Override public void componentHidden(ComponentEvent e) { } public static void main(String[] args) { JFrame frame = new JFrame(""); frame.pack(); frame.addComponentListener(new Main()); frame.setVisible(true); } }