求解释25～32行代码，size是多少？

public class TestStackOfIntegers{

	public static void main(String[] args){

		StackOfIntegers stack = new StackOfIntegers();

		

		for(int i = 0; i < 10; i++)

			stack.push(i);

		while(!stack.empty())

			System.out.print(stack.pop() + " ");

	}

}



class StackOfIntegers{

	private int[] elements;

	private int size;

	private static final int DEFAULT_CAPACITY = 16;

	

	public StackOfIntegers(){

		this(DEFAULT_CAPACITY);

	}

	

	public StackOfIntegers(int capacity){

		elements = new int[capacity];

	}

	

	public void push(int value){

		if(size >= elements.length){

			int[] temp = new int[elements.length * 2];

			System.arraycopy(elements, 0, temp, 0, elements.length);

			elements = temp;

		}

		elements[size++] = value;

	}

	

	public int pop(){

		return elements[--size];

	}

	

	public int peek(){

		return elements[size - 1];

	}

	

	public boolean empty(){

		return size == 0;

	}

	

	public int getSize(){

		return size;

	}

}