// on ESC key close frame getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put( KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), "Cancel"); getRootPane().getActionMap().put("Cancel", new AbstractAction(){ public void actionPerformed(ActionEvent e) { dispose(); } }); // on close window the close method is called setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE); addWindowLis..

JAVA JFrame 최대화 하기 setExtendedState(getExtendedState()|JFrame.MAXIMIZED_BOTH ); Or public class Main extends JFrame implements INotiEvent { final Main mainFrame = new Main(); mainFrame.setExtendedState(mainFrame.getExtendedState()|JFrame.MAXIMIZED_BOTH );