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    <p>In order to answer <strong>How to call the Frame methods from the PApplet?</strong>, I have modified your code snippet to bare minimum. In this modified version when the user click mouse button a <code>System.out</code> is fired.</p> <p>Now there are two ways in which you can access your <code>Frame</code> object. But before that let me state these two points:</p> <ul> <li>When you create a PApplet like <code>new ExampleFrame(new Menu());</code> and add it in your <code>JFrame</code> like this <code>add(app, BorderLayout.CENTER);</code> then a complex hierarchy of windows/panels are created. </li> </ul> <p><strong>Like this:</strong></p> <pre><code>javax.swing.JPanel javax.swing.JLayeredPane javax.swing.JRootPane test.ExampleFrame </code></pre> <ul> <li><code>PApplet</code> provides a public field for setting and accessing your frame object. And amazingly it is called <code>frame</code> :). You can set it before calling <code>app.init();</code></li> </ul> <p><strong>>>Code</strong></p> <p>** Checkout the comments in the code**</p> <p><strong>Modified ExampleFrame.java</strong></p> <pre><code>import java.awt.BorderLayout; import javax.swing.JFrame; import processing.core.PApplet; public class ExampleFrame extends JFrame { private static final long serialVersionUID = 4792534036194728580L; PApplet app; public ExampleFrame(PApplet emApp) { super("Ball Maze Game"); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setLocation(200, 200); app = emApp; setSize(615,438); setVisible(true); setLayout(new BorderLayout()); add(app, BorderLayout.CENTER); // Setting my frame object app.frame = this; app.init(); } // Sample Method public void sampleMethod(String msg) { System.out.println("I think '"+ msg +"' called me !!"); } } </code></pre> <p><strong>Modified Menu.java</strong></p> <pre><code>import java.awt.Container; import processing.core.PApplet; import processing.core.PImage; public class Menu extends PApplet { private static final long serialVersionUID = -6557167654705489372L; PImage background; static String tab = ""; //simple constructor public Menu() { } public void setup() { size(600, 400); smooth(); background = loadImage("C:/temp/background.jpg"); } public void draw() { image(background, 0, 0); } public void mousePressed() { Container p = getParent(); tab = ""; // FIRST WAY OF ACCESSING PARENT FRAME while(p != null) { //printParentTree(p); if(p instanceof ExampleFrame) { ExampleFrame myframe = (ExampleFrame)p; myframe.sampleMethod("First Way"); break; } p = p.getParent(); } // SECOND WAY OF ACCESSING PARENT FRAME if(frame != null &amp;&amp; (frame instanceof ExampleFrame)) { ExampleFrame myframe = (ExampleFrame)p; myframe.sampleMethod("Second Way"); } } void printParentTree(Container p) { System.out.println(tab+p.getClass().getName()); tab +='\t'; } } </code></pre> <p>Checkout the <code>public void mousePressed()</code> method.</p> <p>For completeness, I am also including Main.java.</p> <pre><code>public class Main { public static void main(String[] args){ new ExampleFrame(new Menu()); } } </code></pre> <p>Now to answer <strong>Remove all PApplets contents and load another PApplet in</strong></p> <p>Well I have not tested it. But you can add a <code>JPanel</code> to your <code>JApplet</code> and do all your drawing on that i.e creating child controls etc. When feel like redrawing then call <code>JPanel.removeAll()</code>. Which as per javadoc: </p> <blockquote> <p>Removes all the components from this container. This method also notifies the layout manager to remove the components from this container's layout via the removeLayoutComponent method.</p> </blockquote> <p>After this call <code>repaint</code> on the <code>JPanel</code>. Try it out, it might work :).</p>
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    1. COIn fairness, note that this question relates to [Processing](http://processing.org/). Good luck on the bounty; I'm sitting this one out.
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    2. CO@trashgod: Yup I knew that. Even requested for the original processing code :O. In absence of that I just stripped down the presented snippet and used it for answer. Anyway thanks :)
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