Frame.MAXIMIZED_BOTH
import java.awt.Frame; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowStateListener; public class Main { public static void main() { Frame frame = new Frame(); WindowStateListener listener = new WindowAdapter() { public void windowStateChanged(WindowEvent evt) { int oldState = evt.getOldState(); int newState = evt.getNewState(); if ((oldState & Frame.ICONIFIED) == 0 && (newState & Frame.ICONIFIED) != 0) { System.out.println("Frame was iconized"); } else if ((oldState & Frame.ICONIFIED) != 0 && (newState & Frame.ICONIFIED) == 0) { System.out.println("Frame was deiconized"); } if ((oldState & Frame.MAXIMIZED_BOTH) == 0 && (newState & Frame.MAXIMIZED_BOTH) != 0) { System.out.println("Frame was maximized"); } else if ((oldState & Frame.MAXIMIZED_BOTH) != 0 && (newState & Frame.MAXIMIZED_BOTH) == 0) { System.out.println("Frame was minimized"); } } }; frame.addWindowStateListener(listener); frame.setVisible(true); } }