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Thanks a lot ,Kevin. Your advices is really helpful (especially the debug link o:-)).My teacher told us that the lecture was about OOP not java.Things like threads,GUI... is only taught very little...

I'm writing a program about pasture with entities on it.Here is the engine:


import java.util.*;
import javax.swing.Timer;
import java.awt.event.*;

/**
* The simulation is run by an...

here is the Pasture.
(of course it contains more methods than this but I think these only these methods can cause that error)


private int width = 20;
private int ...

I'm working on my assignment.My task is to create a pasture with entities on it.The entities are sheep,grass.Every second I call method tick() of each entities then they start moving and eating or...