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|Java - Interview Questions and Answers|
|Ans. Here is the list of classes that implements Collections Interface - http://www.buggybread.com/2015/02/java-collections-classes-that-implement.html|
Having Collection interface to extend Cloneable interface would mean necessarily implement clone method by all implementing classes. As not all collection classes allow duplicate elements, it makes no sense to clone elements for them.
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|What is a cloneable interface and what all methods does it contain?|
|Name few classes that implement Cloneable interface ?|
|What is the default data type of state variables in Clonable interface and Serializable interface ?|
|Why the singleton class should never implement Cloneable interface ?|
|How to avoid cloning, serialization in the singleton class ?|