Implement stack as specified below:

public class NumStack{

private int[] data;

private int index;

public NumStack(int cap){

if(cap<1 || cap>100) cap=50;

data= new int[cap];

index =0;

}

public int size(){

}

public void push(int num){}

public void pop(){}

public int top(){}

public boolean isEmpty(){}

public boolean isFull(){}

}

Once completed, design a driver program to test your implementations of these methods.