Creation of simple array based stack

Stack.java

package com.operations.stack;

public class Stack{

	private static final int SIZE = 1024;

	private int N;

	private int t = -1;

	private int[] arr = null;

	public Stack(){
		this.N = SIZE;
		arr = new int[this.N];
	}

	public Stack(int N){
		this.N = N;
		arr = new int[this.N];
	}

	public int pop() throws StackException{
		if(!isEmpty()){
			return this.arr[t--];
		}
		else{
			throw new StackException("Error : Stack is Empty");
		}
	}

	public void push(int num) throws StackException{
		if(size() < this.N){
			this.arr[++t] = num;
		}
		else{
			throw new StackException("Error : Stack is full");
		}
	}

	public int size(){
		return t+1;
	}

	public boolean isEmpty(){
		return t < 0;
	}
}


class StackException extends RuntimeException{
	public StackException(String message){
		super(message);
	}
}