How to use

isPreferredSizeSet

method

in

java.awt.Component

JPanel menuPanel = new JPanel(new GridLayout(1, 0));
for (String menuText : MENU_TEXTS) {
  menuPanel.add(new JButton(menuText));
topPanel.add(menuPanel);
add(topPanel, BorderLayout.PAGE_START);
if (isPreferredSizeSet()) {
  return super.getPreferredSize();
return new Dimension(PREF_W, PREF_H);
SwingMenuDemo2 mainPanel = new SwingMenuDemo2();
JFrame frame = new JFrame("Swing Menu Demo 2");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);

  JPanel innerBotPanel = new JPanel(new GridLayout(1, 0, 3, 0));
  for (int j = 0; j < 50; j++) {
    innerTopPanel.add(new JLabel("Text " + (i + 1)));
    innerBotPanel.add(new JLabel("Text " + (i + 1)));
  topPanel.add(innerTopPanel);
  botPanel.add(innerBotPanel);
if (isPreferredSizeSet()) {
  return super.getPreferredSize();
return new Dimension(PREF_W, height);
JFrame frame = new JFrame("ScrollPaneFun2");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new ScrollPaneFun2());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);

if (isPreferredSizeSet()) {
  return super.getPreferredSize();
return new Dimension(prefW, prefH);
JFrame frame = new JFrame("Game");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(game);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);

  JFrame frame = new JFrame("Siep Frame");
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.add(sierpPanel);
  frame.pack(); // size it to the size of the JPanel
  frame.setVisible(true);
});
if (isPreferredSizeSet() || img == null) {
  return super.getPreferredSize();
return new Dimension(img.getWidth(), img.getHeight());

  add(new JLabel(TITLE_TEXT, SwingConstants.CENTER), BorderLayout.PAGE_START);
  add(scrollPane);
public Dimension getPreferredSize() {
  Dimension superSz = super.getPreferredSize();
  if (isPreferredSizeSet()) {
    return superSz;
  return new Dimension(prefW, prefH);
  FooPanel mainPanel = new FooPanel();
  JFrame frame = new JFrame("Foo Panel");
  frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
  frame.getContentPane().add(mainPanel);
  frame.pack();
  frame.setLocationByPlatform(true);
  frame.setVisible(true);

public Dimension getPreferredSize() {
 Dimension superSize = super.getPreferredSize();
 if (isPreferredSizeSet()) {
   return superSize;
 return new Dimension(w, h);
 JFrame frame = new JFrame("ShowGetPreferredSize");
 frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
 frame.getContentPane().add(new ShowGetPreferredSize());
 frame.pack();
 frame.setLocationRelativeTo(null);
 frame.setVisible(true);

if (isPreferredSizeSet()) {
  return super.getPreferredSize();
return new Dimension(PREF_W, PREF_H);
JFrame frame = new JFrame("My Monopoly");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);

if (isPreferredSizeSet() || img == null) {
  return super.getPreferredSize();
return new Dimension(img.getWidth(), img.getHeight());
ShowRectangle mainPanel = new ShowRectangle(image);
JFrame frame = new JFrame("ShowRectangle");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);

this.add(drawing);
this.setVisible(true);
if (isPreferredSizeSet()) {
  return super.getPreferredSize();
  int w = image.getWidth();
  int h = image.getHeight();
  return new Dimension(w, h);
} else {
  return new Dimension(PREF_W, PREF_H);
JFrame frame = new JFrame("Draw");
try {
  frame.add(new Draw(args));
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.pack();
  frame.setVisible(true);
} catch (IOException e) {
  e.printStackTrace();

if (isPreferredSizeSet()) {
  return super.getPreferredSize();
return new Dimension(PREF_W, PREF_H);
LineDraw mainPanel = new LineDraw();
JFrame frame = new JFrame("Line Draw");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);

if (isPreferredSizeSet()) {
  return super.getPreferredSize();
return new Dimension(PREF_W, PREF_H);
JFrame frame = new JFrame("Test Center Layout");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(new GridBagLayout());
frame.getContentPane().add(new TestCenterLayout());
frame.pack();
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
frame.setVisible(true);

add(scrollPane);
if (isPreferredSizeSet()) {
  return super.getPreferredSize();
return new Dimension(PREF_W, PREF_H);
JFrame frame = new JFrame("ImageInScrollPane");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);

frame = new JFrame("Snake");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(drawBoard = new DrawBoard(), BorderLayout.CENTER);
frame.getContentPane().add(new BottomComponent(), BorderLayout.PAGE_END);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
ticker.start();
if (isPreferredSizeSet()) {
  return super.getPreferredSize();
return new Dimension(PREF_W, PREF_H);
if (isPreferredSizeSet()) {
  return super.getPreferredSize();
return new Dimension(PREF_W, PREF_H);

closeButton.addActionListener(this);
add(closeButton);
if (isPreferredSizeSet()) {
  return super.getPreferredSize();
return new Dimension(PREF_W, PREF_H);
JFrame frame = new JFrame("Close From JPanel");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new CloseFromJPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);

msgHoldingPanel.add(msg);
msgHoldingPanel.add(Box.createVerticalStrut(3));
msgHoldingPanel.add(msg2);
if (isPreferredSizeSet()) {
  return super.getPreferredSize();
return new Dimension(PREF_W, PREF_H);
JFrame frame = new JFrame("MainPanel");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new MainPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);

Car mainPanel = new Car();
JFrame frame = new JFrame("A Car");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
if (isPreferredSizeSet()) {
  return super.getPreferredSize();
return new Dimension(PREF_W, PREF_H);

public Dimension getPreferredSize() {
 Dimension superSize = super.getPreferredSize();
 if (isPreferredSizeSet()) {
   return superSize;
 return new Dimension(prefW, prefH);
 JFrame frame = new JFrame("Pruebax1");
 frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
 frame.getContentPane().add(mainPanel);
 frame.pack();
 frame.setLocationByPlatform(true);
 frame.setVisible(true);

if (isPreferredSizeSet()) {
  return super.getPreferredSize();
return new Dimension(PREF_W, PREF_H);
JFrame application = new JFrame();
application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
application.add(panel);
application.pack();
application.setLocationRelativeTo(null);
application.setVisible(true);

add(promptLabel);
add(textField);
if (isPreferredSizeSet()) {
  return super.getPreferredSize();
return new Dimension(PREF_W, PREF_H);
BackgroundPanel mainPanel = new BackgroundPanel();
JFrame frame = new JFrame("BackgroundPanel");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);

JFrame frame = new JFrame("Boxy Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new BoxyPanel(200, 300));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
if (isPreferredSizeSet()) {
  return super.getPreferredSize();
return new Dimension(PREF_W, PREF_H);