Making an applet

Question

I have the problem that I am not getting my results, why?

public class cycle extends JApplet implements ActionListener {

  Panel panel = new Panel();
  JButton left = new JButton("left");
  JButton right = new JButton("right");
  Container c = getContentPane();

  public void frame() {
    Panel panel = new Panel();
    JButton left = new JButton("left");
    JButton right = new JButton("right");
    c.add(left);
    c.add(right);
  }

  public static void main(String[] args) {
    JFrame f = new JFrame();
    f.setTitle("Move the ball");
    f.setSize(500, 500);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
  }

  @Override
  public void actionPerformed(ActionEvent e) {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

}

Answer 1

Change your code this way:

• Add the Buttons to your JPanel
• Add the Panel to the ContentPane
• Add your cycle object to the JFrame

Here is the modified code

public class cycle extends JApplet implements ActionListener {

  private JPanel panel;
  private JButton left;
  private JButton right;
  private Container c = getContentPane();

  public cycle() {
    panel = new JPanel();
    left = new JButton("left");
    right = new JButton("right");
    panel.add(left);
    panel.add(right);
    c.add(panel);
  }

  public static void main(String[] args) {
    JFrame f = new JFrame();
    f.setTitle("Move the ball");
    f.setSize(500, 500);
    f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    f.add(new cycle());

    f.setVisible(true);
  }

  @Override
  public void actionPerformed(ActionEvent e) {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
  }

}

Also:

• I would suggest you rename your class Cycle, it is a Java convention to start with an upper case.
• Use WindowConstants.EXIT_ON_CLOSE instead of JFrame.EXIT_ON_CLOSE
• As suggested below in the comments by Andrew Thompson: Don't mix Swing & AWT components. (The Panel should be a JPanel)