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    <p>From the code:</p> <pre><code>img = new ImageEditor(); panel = new ImageEditor(); panel.setBounds(10, 11, 152, 151); panel.add(img); getContentPane().add(panel); </code></pre> <p>You are defining <code>img</code> as an <code>ImageEditor</code>, but you probably meant for it to be a <code>BufferedImage</code>. You are then adding it to <code>panel</code>, which is another <code>ImageEditor</code> - but it is being added through the superclass method <code>JPanel.add</code>, when you probably meant to use the method you wrote, <code>ImageEditor.setImage()</code>.</p> <p>EDIT: To summarize:</p> <p>The tiny block of updating pixels you described is the <code>BufferedImage</code> (<code>img.img</code>), inside of your <code>ImageEditor img</code>, which is in turn inside of the <code>ImageEditor panel</code>, which is itself inside the applet's content pane.</p> <ul> <li><p>replace <code>static ImageEditor img</code> in the <code>MainTest</code> class with <code>BufferedImage img</code></p></li> <li><p>replace <code>img = new ImageEditor</code> in <code>MainTest</code>'s no-args constructor with <code>img = new BufferedImage()</code></p></li> <li><p>replace <code>panel.add(img)</code> in <code>MainTest</code>'s no-args constructor with <code>panel.setImage(img)</code></p></li> <li><p>replace <code>static ImageEditor mock</code> in the <code>ThirdClass</code> class with <code>BufferedImage mock</code></p></li> <li><p>replace the <code>ImageEditor img</code> argument in <code>ThirdClass</code>'s constructor with <code>BufferedImage img</code> </p></li> <li><p>replace any other stuff involving <code>img</code> to correctly handle it as a <code>BufferedImage</code></p></li> </ul> <p>One other thing, although this problem isn't itself the cause of any program malfunction, you should rename the <code>Train()</code> method in <code>ThirdClass</code> to something like <code>train()</code> so it matches proper java style.</p>
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    1. POHaving trouble with dynamically updating a BufferedImage
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    1. COThanks for pointing this out. Yes!!! I intended it to be the BufferedImage. I cannot check now since I just left office. I will check tomorrow.
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    2. COI did the modification but now the updating small square is there but it is not the desired result. The code modified is as follows img = new ImageEditor();panel = new JPanel();
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    3. CO@Synex I have edited my answer to be more clear about exactly what changes I was proposing.
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