Implementation Of Stack Methods - Declaration Of Stack1 And Stack2

I have to implement all the stack methods in java such as push, pop empty, not using the ready methods but have to create them and to execute an exercise but is sth wrong with it

public class Stiva {

/** the problem is here how to declare the stack 1 and stack 2 and kreu(head) gjmax(size)*/

int Gjmax;
int array[] = new int[Gjmax];
int kreu;
private Stiva stiva1;
private Stiva stiva2;

[Code] .....