Why collection doesn’t extend cloneable and serializable interfaces?
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What are recursive functions? Give some examples?
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What is the need to implement Serializable interface (with no methods) for objects which are to be serialized ? We can write our own functionality which writes objects to streams then why we need to implement and tell JVM that which objects can be serialized.
Why do we override tostring method in java?
What is the benefit of inner classes in java?
What are inner and anonymous class?
Explain purpose of sleep() method in java?
What is the size of integer?
What are the main differences between the java platform and other platforms?
What do you mean by inner class in java? Explain
Is a boolean variable?
why we need this (1.object,2.class,3.data hiding,4.encapsulation,5.abstraction,6. polymorphism,7.inheritance)
Can a class extend abstract class or interface? why
Core Java 
