I have an abstract class and in that abstract class I have an array and I want every class that extends it to have the array 2 ints long no matter what. I know you can define array size in methods but thats all you can do it in. Here's some code
public abstract class entity{
int pos[]
// want this variable to be two ints long no matter what extends it
}
Is this possible?
You could instantiate the array in the superclass and limit the access to it with methods. That way no subclass can change the size of the array.
private int[] pos = new int[2];
protected void setPos(int index, int value) {
pos[index] = value;
}
protected int getPos(int index) {
return pos[index];
}
Why do you need the extending classes to initialize it? You can initialize it to int[2] in the super class itself.
BTW your class entity should be called Entity. pos can be final or private or both.
protected final int[] pos = new int[2];
Declaring it protected ensures that all types that are derived from it will have access to it.
Declaring it final ensures that no derived type will change what the reference points to.
try this
int[] pos = new int[2];
