public interface Cloneable
Cloneable interface to
 indicate to the Object.clone() method that it
 is legal for that method to make a
 field-for-field copy of instances of that class.
 
 Invoking Object's clone method on an instance that does not implement the
 Cloneable interface results in the exception
 CloneNotSupportedException being thrown.
 
 By convention, classes that implement this interface should override
 Object.clone (which is protected) with a public method.
 See Object.clone() for details on overriding this
 method.
 
Note that this interface does not contain the clone method. Therefore, it is not possible to clone an object merely by virtue of the fact that it implements this interface. Even if the clone method is invoked reflectively, there is no guarantee that it will succeed.
CloneNotSupportedException, 
Object.clone() Submit a bug or feature 
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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