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    <p>It is better for various reasons, including:</p> <ul> <li>In most Swing components, custom painting is achieved by overriding the <code>paintComponent(Graphics)</code> method. Top-level Swing containers (e.g. <code>JFrame</code>, <code>JApplet</code>, <code>JWindow</code>) have only <code>paint(Graphics)</code>. As a result of the common method for painting, people who answer often forget about this difference between common and top-level components, and therefore suggest silly advice. ;)</li> <li>A <code>JComponent</code> can be added to a <code>JFrame</code>, or a <code>JApplet</code>, or a <code>JDialog</code>, or a constraint of a layout in a <code>JPanel</code>, or a <code>JInternalFrame</code>, or a.. Just when you think your GUI is complete, the client says "Hey, wouldn't it be great to throw in a tool-bar &amp; offer it as an applet as well?" The <code>JComponent</code> approach adapts easily to that.</li> <li>As explained (complete with code!) by Richante, it is easier to calculate the co-ordinates required for painting the custom component, and if it has a preferred size, to size the <code>JFrame</code> to be 'exactly the right size' to contain the GUI (using <code>pack()</code>). That is especially the case when other components are added as well.</li> </ul> <hr> <p>Now, two minor disagreements with the advice offered.</p> <p>If the entire component is custom painted, it might be better to simply put a <code>BufferedImage</code> inside an <code>ImageIcon</code>/<code>JLabel</code> combo. Here is an example of <a href="https://stackoverflow.com/a/10055672/418556">painting to an image</a>.<br> When it comes time to update it:</p> <ol> <li>Call <code>getGraphics()</code> for a <code>Graphics</code> or <code>createGraphics()</code> for a <code>Graphics2D</code></li> <li>Draw the custom painting to that graphics instance</li> <li>Dispose of the graphics instance</li> <li>Call <code>repaint()</code> on the label.</li> </ol>
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    1. POWhy is attaching a JPanel better?
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    1. USAndrew Thompson
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    1. POWhy is attaching a JPanel better?
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    1. COThere's some benefit to getting the panel's UI delegate.
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    2. CO@trashgod Thanks for reminding me. There are some things though, that I do not understand. 1) It seems that the panel UI is obtained from [`JPanel.getUI()`](http://docs.oracle.com/javase/7/docs/api/javax/swing/JPanel.html#getUI%28%29), is that correct? 2) Why would a `JComponent` not (have/have access to) a UI delegate of it's own? 3) Should I start my own question(s) on these matters?
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    3. COA `JComponent` has no delegate itself, but it provides some basic infrastructure for subclasses that do. [*How to Write a Custom Swing Component*](http://today.java.net/pub/a/today/2007/02/22/how-to-write-custom-swing-component.html) is an example.
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