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import javax.swing. JTextArea; JOptionPane.showMessageDialog(null, text, "Copy and paste", JOptionPane.INFORMATION_MESSAGE); I think only those lines are really necessary because i just tried them and it worked but i guess it depends on how your code was designed .

You will need a reference to the GreenfootSound object and add a 'public void stopped()' method to the world class with a statement to stop the music in it.

What is the code required to flip the image.

I still have a problem in my world with the addBall method in my world , could you please help ? it says can't find variable Empty . import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo) /** * Write a description of class Nature here. * * @author (your name) * @version (a version number or a date) */ public class Nature extends World { private Paddle paddle; //private Counter counter; /** * Constructor for objects of class Nature. * */ public Nature() { // Create a new world with 600x400 ce

The five-line snippet should probably go within an 'if' block whose conditions determine that it is time to change worlds. The code was not particularly written for being in a world class code or an actor class code. Line 5 should start with 'getWorld().' if in an actor class and lines 3 and 4 should not have 'getWorld().' if in a world class.

Oh yes indeed I'm sorry danpost

I cannot say without seeing what code you have now. It might be because you placed the code incorrectly within the class; or any one of many other reasons.

Thanks!

I want to make things happen for a specific number of seconds, instead of a arbitrary number of act cycles. I'll use System.currentTimeMillis().

You do not want to execute the last three 'if' statements every act; only when the score increases. So move those 'if' statements up inside the previous one right after increasing the score value.

A good source of information pertaining to programming in java can be found in the Java tutorials. The second section on the left titled in red (Trails Covering the Basics) is the place to start (especially the sub-section called 'Learning the Java Language'.

It varies; but a general rule for a scenario running at standard speed (speed slider in the middle) is somewhere around 55 to 60 cycles per second.