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POWhat is wrong with my Swing application?
 

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  1. POWhat is wrong with my Swing application?
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    <p><strong>EDITED 2/2/2013</strong></p> <p>With the help of some of your answers and a simple Swing application guide I found, I was able to make a little bit of progress and I put it all in one class for now. However, I still can't get it to close and I had to make a button to do it because it was getting really annoying having to pull up task manager. The tooltips aren't working either. I don't know if it matters, but I'm doing it in Eclipse.</p> <pre><code>import javax.swing.SwingUtilities; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JButton; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class Thing extends JFrame { private static final long serialVersionUID = 1L; public Thing() { setTitle("Thing"); setSize(1024, 768); setLocationRelativeTo(null); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setResizable(false); JPanel panel = new JPanel(); getContentPane().add(panel); panel.setLayout(null); panel.setToolTipText("A panel container"); JButton quit = new JButton("Quit"); quit.setBounds(50, 60, 80, 30); quit.setToolTipText("A button component"); quit.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { System.exit(0); } }); panel.add(quit); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { Thing thing = new Thing(); thing.setVisible(true); } }); } } </code></pre> <p>This is the error it gives when I try to close it with the X. (The closing works fine with the button)</p> <pre><code>java.lang.NoClassDefFoundError: sun/awt/TimedWindowEvent at sun.awt.windows.WToolkit.eventLoop(Native Method) at sun.awt.windows.WToolkit.run(Unknown Source) at java.lang.Thread.run(Unknown Source) </code></pre>
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    1. COJust a note: You should load the image in the constructor, and then store a referance to the image, instead of loading the image each time you want to draw it.
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    2. CO`g.drawImage(Toolkit.getDefaultToolkit().getImage("image.jpg"), 0, 0, null);` Do not try to load the image in a paint method! Read it when constructed (or better, define a constructor that accepts an `Image`). And simply paint it in paint. So presuming it is a class attribute named `image` that might become.. `g.drawImage(image, 0, 0, this);`
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      1. POWhat is wrong with my Swing application?
      1. USAndrew Thompson
    3. CO1) `Title` should return a preferred size of (presumably) 1200x1200. 2) Once you've done that, `pack()` the frame and `setLocationByPlatform(true)` 3) Unless this image is intended to be a BG for other components, consider displaying it in a label. 4) Forgot to highlight the reference to `this` in the final code snippet. A `JPanel` implements `ImageObserver`, so use the object itself for the image load notification. A repaint will be triggered as more of the image becomes available.
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