What is map and hashmap in java?
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How does list work in java?
What about instanceof operator in java?
Can interface be private in java?
java is puerly object oriented or not ?
Can a singleton class be inherited?
What are the drawbacks of reflection?
Is arraylist ordered?
How will you measure that int takes up only 32 bits in memory?
What is keyword auto for?
How we can generate random numbers in java?
Does collectionutils isempty check for null?
waht You know about thread programming?