What is the purpose of void class?
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What is user defined exception in Java?
Explain listiterator and methods in listiterator?
Explain pass by reference and pass by value?
why HashTable not allow null key and value
i need example for java abstraction. where we use abstraction and why we need abstraction.
What is difference between hashset and hashmap?
What is a constructor, constructor overloading in java?
Explain about anonymous inner classes in java?
I want to persist data of objects for later use. What is the best approach to do so?
Which collection is ordered in java?
What is the console in java?
What is singleton service?