What is the use of hashmap in java?
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What is __ init __ functions?
What is overloading and overriding in java?
What is visibility mode?
What are different types of inner classes ?
Can we override final method?
write the hierarchy of component class?
What are default methods ?
Does string isempty check for null?
Is it necessary for the port addresses to be unique? Explain with reason.
What is super?
Which data type is class in java?
What are access modifiers in Java ?