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    <p><strike>Did you implement the Cloneable interface on your object?</strike></p> <p>However, there are very few cases I would use clone for copying an object. One such safe example is array.clone(). I would rather use the copy-constructor idiom or manually copying / assigning values around.</p> <p>There is Item#11 in <a href="http://java.sun.com/docs/books/effective/" rel="nofollow noreferrer">Effective Java</a> (2nd edition) about the background issue. Cloneable interface is a special kind of interface as it modifies the <code>Object</code> class' behavior regarding the cloning. Basically it is a feature enabling <strike>class</strike>interface in Java.</p> <p><strong>Edit:</strong> Based on your example you might need to wrap the clone() call in a try-catch of CloneNotSupportedException in a general case.</p> <p><strong>Edit2:</strong> Rephrased my answer</p> <p><strong>Edit3:</strong> Did you override the clone() in the <code>public</code> context? In the sample you gave you try to clone an Object, which is in the java.lang package - hardly the package your code is in.</p> <p><strong>Edit4:</strong> I think the answer is already in the other posts, just wanted to reflect on the underlying issue.</p> <p><strong>Edit5:</strong> Try this:</p> <pre><code>public Object clone1() throws CloneNotSupportedException { return super.clone(); } </code></pre> <p><strong>Edit6</strong> Then name your method <code>public abstract Object copy()</code> for example and in the implementation, use the super.clone() - to avoid confusion.</p> <p><strong>Edit7</strong> I did some eclipsing and came out with the following solution:</p> <pre><code>public class Cloner { public static abstract class Person { protected abstract Object clone1() throws CloneNotSupportedException; public Object copy() throws CloneNotSupportedException { return clone1(); } } public static class Employee extends Person implements Cloneable { @Override protected Object clone1() throws CloneNotSupportedException { return super.clone(); } } public static void main(String[] args) throws Exception { new Employee().copy(); } } </code></pre> <p>But basically it is the same concept as renaming your abstract method to something else than clone().</p> <p><strong>Edit8:</strong> Fixed my sample, now it works without exception.</p> <p>(But the actual credit goes to <em>Gábor Hargitai</em> for <code>super.clone()</code>)</p>
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    1. POWhat is wrong with this clone()?
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    1. COYes I have implemented Cloneable interface.
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    2. COI have put it in try catch block but it still has that error.
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    3. COI can not use super.clone() . here super is Person and Person has an abstract clone()!!! How can I call super.clone()????
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