(Revise the MyStack class) Rewrite the MyStack class in Listing 11.10 to perform a deep copy of the list field

/*********************************************************************************
* (Revise the MyStack class) Rewrite the MyStack class in Listing 11.10 to       *
* perform a deep copy of the list field.                                         *
*********************************************************************************/
public class Exercise_13_08 {
	/** Main method */
	public static void main(String[] args) throws CloneNotSupportedException {
		// Create a MyStack object
		MyStack stack1 = new MyStack();

		// Push objects on to stack1
		System.out.println("Pushing the number 4, 5, and 6 to 1st stack...");
		stack1.push(new Integer(4));
		stack1.push(new Integer(5));
		stack1.push(new Integer(6));

		// Clone stack1 and assign the clone to stack2
		System.out.println("Cloning 1st stack...");
		MyStack stack2 = (MyStack)stack1.clone();

		// Pop an object from stack1
		System.out.println("Popping object from 1st stack...");
		stack1.pop();

		// Display results
		System.out.print("1st ");
		System.out.println(stack1);
		System.out.print("2nd ");
		System.out.println(stack2);
		System.out.println("Is the 1st stack equal to the 2nd? " + 
			(stack1 == stack2));
	}
}

MyStack.java 

import java.util.ArrayList;

public class MyStack implements Cloneable {
	private ArrayList<Object> list = new ArrayList<Object>();

	public boolean isEmpty() {
		return list.isEmpty();
	}

	public int getSize() {
		return list.size();
	}

	public Object peek() {
		return list.get(getSize() - 1);
	}

	public Object pop() {
		Object o = list.get(getSize() - 1);
		list.remove(getSize() - 1);
		return o;
	}

	public void push(Object o) {
		list.add(o);
	}

	@Override /** Override the protected clone method define in 
		the Object class, and strengthen its accessibility */
	public Object clone() throws CloneNotSupportedException {
		// Perform a shollow copy
		MyStack myStackClone = (MyStack)super.clone();
		// Deep copy list 
		myStackClone.list = copyList();
		return myStackClone;
	}

	/** Returns a copy of a list */
	private ArrayList<Object> copyList() {
		ArrayList<Object> newList = new ArrayList<>();
		for (int i = 0; i < list.size(); i++) 
			newList.add(list.get(i));
		return newList;
	}

	@Override 
	public String toString() {
		return "stack: " + list.toString();
	}
}