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POJava - Preventing Java Heap memory error using Swing framework and abstract classes
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2012-03-19T18:32:49.173
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2012-03-21T12:41:47.293
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Really hope you can assist. I have built a stock management application with the Java Swing framework. This application has 1 abstract class named GUIRules which extends JPanel implements actionListener, and 8 different classes which extend GUIRules to represent each screen. <pre><code>public abstract class GUIRules extends JPanel implements ActionListener{} public class login extends GUIRules {} </code></pre> The fact is all of these 8 classes have a lot in common; hence the reason I decided to provide each one of them with default functionality. When I navigate to each screen, all loads up fine; however, I eventually encounter Java Heap memory error. This is the method which enables the changing of screen: <pre><code> /** * When switching between GUI screens, declare new GUI within parameters * @param panel */ public void changePanel(JPanel panel){ this.removeAll(); this.add(panel); validate(); setVisible(true); } </code></pre> this.removeAll() is supposed to remove all components, thereby freeing memory. All action listeners are added within the constructors of all the 8 screens; so this should also get disposed of when this function is called. This application also utilises images as well. The abstract class (GUIrules) calls paintComponent() to load the background image: <pre><code> /** * Paint background, menu and logo images onto this class. */ public void paintComponent(Graphics g) { super.paintComponent(g); g.drawImage(image.mainImg, 0, 0,getWidth(),getHeight(),null); g.drawImage(image.menuImg, 0, 30, getWidth(), 80, null); g.drawImage(image.logoImg, 0, 33, null); g.setColor(Color.CYAN); g.drawString(SystemSession.user, 10, 20); g.drawString(SystemSession.status, 10, getHeight()-10); repaint(); } </code></pre> I have used Runtime.gc() to garbage collect unused objects but not much difference. Any ideas? Many thanks.
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<java><swing><memory-management>
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Java - Preventing Java Heap memory error using Swing framework and abstract classes
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