How to use

pack

method

in

javax.swing.JFrame

 @Override
 public void run() {
  // Create and set up the window.
  JFrame frame = new JFrame("XChart");
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.add(chartPanel);
  // Display the window.
  frame.pack();
  frame.setVisible(true);
 }
});

public static void main(final String[] args) {
  final JFrame j = new OSMMapTilePackagerUI();
  j.setPreferredSize(new Dimension(640, 400));
  j.setDefaultCloseOperation(EXIT_ON_CLOSE);
  j.pack();
  j.setVisible(true);
}

  public void run(){
    JPopupMenu.setDefaultLightWeightPopupEnabled(false);
    createFrame();
    currentPanel.add(canvas, BorderLayout.CENTER);
    frame.pack();
    startApp();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }
});

  @Override
  public void run() {
    errorWindow.getContentPane().removeAll();
    JTextArea textArea = new JTextArea();
    textArea.setEditable(false);
    StringBuilder text = new StringBuilder();
    text.append("An exceptional error occurred!\nYou can try to continue or exit the application.\n\n");
    text.append("Please tell us about this here:\nhttp://www.4thline.org/projects/mailinglists-cling.html\n\n");
    text.append("-------------------------------------------------------------------------------------------------------------\n\n");
    Writer stackTrace = new StringWriter();
    throwable.printStackTrace(new PrintWriter(stackTrace));
    text.append(stackTrace.toString());
    textArea.setText(text.toString());
    JScrollPane pane = new JScrollPane(textArea);
    errorWindow.getContentPane().add(pane, BorderLayout.CENTER);
    JButton exitButton = new JButton("Exit Application");
    exitButton.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        System.exit(1);
      }
    });
    errorWindow.getContentPane().add(exitButton, BorderLayout.SOUTH);
    errorWindow.pack();
    Application.center(errorWindow);
    textArea.setCaretPosition(0);
    errorWindow.setVisible(true);
  }
});

 JFrame jf = new JFrame();
JPanel jp = new JPanel();
jp.setPreferredSize(new Dimension(400,800));// changed it to preferredSize, Thanks!
jf.getContentPane().add( jp );// adding to content pane will work here. Please read the comment bellow.
jf.pack();

 @Override
 public void run() {
  // Create and set up the window.
  // Add content to the window.
  frame.add(ExampleChartTester.this);
  // Display the window.
  frame.pack();
  frame.setVisible(true);
 }
});

public void toggleLogPanel() {
  if (!logPanelVisible) {
    getView().add(getLogPanel(), BorderLayout.CENTER);
    getLogController().getLogTableModel().setPaused(false);
    logPanelVisible = true;
  } else {
    getView().remove(getLogPanel());
    getLogController().getLogTableModel().setPaused(true);
    logPanelVisible = false;
  }
  getView().pack();
}

 @Override
 public void run() {
  // Create and set up the window.
  JFrame frame = new JFrame("XChart");
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.add(chartPanel);
  // Display the window.
  frame.pack();
  frame.setVisible(true);
 }
});

 private void makeGUI()
{
  final JFrame f = new JFrame();
  f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  f.getContentPane().setLayout(new FlowLayout());

  // include: "class AnswerWorker" code here.
  // include: "JButton" b code here.

  f.getContentPane().add(b);
  f.getContentPane().add(new JButton("Nothing"));
  f.pack();
  f.setVisible(true);
}

JFrame frame = new JFrame("FooRendererTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel); // or whatever...
frame.pack();
frame.setLocationRelativeTo(null);  // *** this will center your app ***
frame.setVisible(true);

 public static void main(String[] args) {
  JFrame frame = new JFrame("MyForm");
  frame.setContentPane(new MyForm().mainPanel);
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.pack();
  frame.setVisible(true);
}

public static void main(String[] args) throws MalformedURLException {
   URL url = new URL("<URL to your Animated GIF>");
   Icon icon = new ImageIcon(url);
   JLabel label = new JLabel(icon);
   JFrame f = new JFrame("Animation");
   f.getContentPane().add(label);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   f.pack();
   f.setLocationRelativeTo(null);
   f.setVisible(true);
 }

/**
 * show the image as JFrame on desktop
 */
public void show() {
  JLabel label = new JLabel(new ImageIcon(this.image));
  JFrame f = new JFrame();
  f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  f.getContentPane().add(label);
  f.pack();
  f.setVisible(true);
}

 JFrame jFrame = new JFrame("Test");
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//jFrame.setLocationRelativeTo(null);
jFrame.setSize(600, 600);
jFrame.pack();
jFrame.setVisible(true);
jFrame.setLocationRelativeTo(null); //To center the code

 JFrame frame = new JFrame();
frame.setLayout(new GridLayout());
JLabel label = new JLabel("<html>First line<br>Second line</html>");
frame.add(label);
frame.pack();
frame.setVisible(true);

 JFrame frame = new JFrame("test");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
JPanel panel = new JPanel(new GridLayout(4,4,4,4));

for(int i=0 ; i<16 ; i++){
  JButton btn = new JButton(String.valueOf(i));
  btn.setPreferredSize(new Dimension(40, 40));
  panel.add(btn);
}
frame.setContentPane(panel);
frame.pack();
frame.setVisible(true);

private static void createAndShowGUI() {
  // Create and set up the window.
  JFrame frame = new JFrame("SpotBugs browser integration Test");
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  // Add content to the window.
  frame.add(new TestDesktopIntegration());
  // Display the window.
  frame.pack();
  frame.setLocationRelativeTo(null);
  frame.setVisible(true);
}

 JFrame frame = new JFrame();
frame.getContentPane().setLayout(new FlowLayout());
frame.getContentPane().add(new JLabel(new ImageIcon(img)));
frame.getContentPane().add(new JLabel(new ImageIcon(img2)));
frame.getContentPane().add(new JLabel(new ImageIcon(img3)));
frame.pack();
frame.setVisible(true);
//frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // if you want the X button to close the app

public void show(){
  frame = new JFrame("HDR View");
  label = new JLabel(new ImageIcon(image));
  frame.getContentPane().add(label);
  frame.setLayout(new FlowLayout());
  frame.pack();
  frame.setVisible(true);
}

private static void createWindowForPanel(AwtPanel panel, int location){
  JFrame frame = new JFrame("Render Display " + location);
  frame.getContentPane().setLayout(new BorderLayout());
  frame.getContentPane().add(panel, BorderLayout.CENTER);
  frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
  frame.addWindowListener(new WindowAdapter() {
    @Override
    public void windowClosed(WindowEvent e) {
      if (++panelsClosed == 2){
        app.stop();
      }
    }
  });
  frame.pack();
  frame.setLocation(location, Toolkit.getDefaultToolkit().getScreenSize().height - 400);
  frame.setVisible(true);
}