Java Utililty Methods JFrame Parent

if (frame == null) {
    frame = new Frame();
    frame.setSize(Toolkit.getDefaultToolkit().getScreenSize());
    positionCenterScreen(frame);
return frame;

Component lParent = aComp;
while (lParent != null && !(lParent instanceof JFrame)) {
    lParent = lParent.getParent();
if (lParent != null && lParent instanceof JFrame) {
    return (JFrame) lParent;
return null;
...

if (c != null) {
    Window window = SwingUtilities.getWindowAncestor(c);
    if (window instanceof Frame) {
        return (Frame) window;
    } else if (window instanceof Dialog) {
        Dialog dialog = (Dialog) window;
        return getRootFrame(dialog.getOwner());
return getPhonyFrame();

java.awt.Component root = javax.swing.SwingUtilities.getRoot(c);
if (root instanceof java.awt.Frame) {
    return (java.awt.Frame) root;
} else {
    return null;

Component c = component;
while (!(c instanceof Frame))
    c = c.getParent();
return ((Frame) c);

JFileChooser fileChooser = new JFileChooser();
fileChooser.setDialogTitle("Set IBM SPSS directory");
fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
fileChooser.setMultiSelectionEnabled(false);
fileChooser.showOpenDialog(null);
System.out.println(fileChooser.getSelectedFile().getPath());

JRootPane root = frame.getRootPane();
root.getInputMap(condition).put(keyStroke, actionKey);
root.getActionMap().put(actionKey, action);

synchronized (frame) {
    JRootPane rootPane = frame.getRootPane();
    Object obj = rootPane.getClientProperty(WINDOW_MODIFIED);
    if (obj == null || !(obj instanceof Boolean)) {
        return Boolean.FALSE;
    return (Boolean) obj;

File f = new File(fileName);
if (f.isDirectory()) {
    JOptionPane.showMessageDialog(parent, fileName + " is a directory.", "Error!",
            JOptionPane.ERROR_MESSAGE);
    return false;
} else if (f.exists()) {
    int saveAnswer = JOptionPane.showConfirmDialog(parent,
            "File " + fileName + " already exists.\nDo you want to overwrite?", "Question",
...

JOptionPane.showMessageDialog(parent, s, "Oops", JOptionPane.INFORMATION_MESSAGE);