implements Cloneable interface to create Cloneable class

Description

Demo Code

import java.util.*;

class Stack2<T> implements Cloneable {
    private ArrayList<T> items;
    private int top = 0;

    public Stack2() {
        items = new ArrayList<T>();
    }/*from   w  w w .ja v a 2 s. co m*/

    public void push(T item) {
        items.add(item);
        top++;
    }

    public T pop() {
        if (items.size() == 0)
            throw new EmptyStackException();
        T obj = items.get(--top);
        return obj;
    }

    public boolean isEmpty() {
        if (items.size() == 0)
            return true;
        else
            return false;
    }

    protected Stack2<T> clone() {
        try {
            Stack2<T> s = (Stack2<T>) super.clone(); //Clone the stack.
            s.items = (ArrayList<T>) items.clone(); //Clone the list.
            return s; // Return the clone
        } catch (CloneNotSupportedException e) {
            //This shouldn't happen because Stack is Cloneable.
            throw new InternalError();
        }
    }
}
public class StackTest2 {
    public static void main(String[] args) {
        Stack2<String> s = new Stack2<String>();
        s.push("hi");
        s.push("hello");
        s.push("good day");
        Stack2<String> s2 = s.clone();
        System.out.format("%s%n", s.pop());
        System.out.format("%s%n", s.pop());
        System.out.format("%s%n", s.pop());
        System.out.format("%s%n", s2.pop());
    }
}
/*
 * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
implements Cloneable interface to create Cloneable class - Java Object Oriented Design

Description

Demo Code

Result

Related Tutorials
