WindowEvent.getNewState() has the following syntax.
public int getNewState()
In the following code shows how to use WindowEvent.getNewState() method.
import java.awt.event.WindowEvent; //w ww . j av a 2 s. c o m import javax.swing.JFrame; public class Main extends JFrame { public Main() { setDefaultCloseOperation(EXIT_ON_CLOSE); enableEvents(java.awt.AWTEvent.WINDOW_EVENT_MASK); } protected void processWindowEvent(WindowEvent e) { System.out.println(e.getNewState()==WindowEvent.WINDOW_ACTIVATED); super.processWindowEvent(e); // Pass on the event } public static void main(String[] a) { Main window = new Main(); window.setBounds(30, 30, 300, 300); window.setVisible(true); } }