How many types of classes are there in java?
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Can a static block throw exception?
What does this () mean in java?
Which list does not allow duplicates in java?
Why collection doesn’t extend cloneable and serializable interfaces?
What is primitive array?
What is the size of string?
What is the effect of keeping a constructor private?
In which JDK version event-delegation model is introduced?
How listener identify that the event came from a particular object?
Difference between Interface & Abstract class?
What is hashmap in java?
Explain the overview of UDP messaging.