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Can it be done? Change an instance variable for al the object from a class at once? Without making it non static?

But won't that only work when I put it in the IDier interface?

It does... that's to bad. Thank you!

So what's a solution to keep track wich IDier[x][y] has already gone trough the move method?

But I cannot change the interface. I put the boolean in dier wich implements IDier. so on a ecosysteem[x][y] there should be a Dier class found.

ecosysteem's type is an IDier[][].

but the content of the IDier[][] ecosysteem are object of those classes?

Ecosysteem.java is a class that has a constructor for the IDier[][] ecosysteem. These methods are only in Konijn and Vos.

ecosysteem is an Idier[][] created in Ecosysteem.java.
It doenst have a getVerplaatst method. I put that in Vos.java and Konijn.java.
These are the methods:
public boolean getVerplaatst(){return...

I've put the methods in Konijn and Vos. When compilating I get this error:
estrun.java:16: cannot find symbol
symbol : method getVerplaatst()
location: interface IDier
...

Maybe make a method getBoolean and setBoolean within ecosysteem.java?

Alright I'll sum, it up.

Two interfaces,
Idier.java - This is the interface for the animals
Dier.java - implements the IDier interface
Konijn.java - extends Dier.java
Vos.java - extends...

I have an other question however:
I got an interface, IDier(Ianimal), wich is implemented by Dier(animal), wich is extended by Vos(fox) and Konijn(rabbit). I need to keep track of the Foxes and...

I have figured it out. The problem is that it doesnt generate new random numbers so it won't be true. Solved! Haha thanks anyways!

Hello everybody! I'm new to this forum and also not very experienced in Java. I follow it as a course in my study!

I'm currently working on a assignment wich is to create an ecosystem.
I need a...