What is a hashmap used for?
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What is the collections api in java programming?
What is the main purpose of serialization in java?
diff. b/w JAVA and javascript...
What is a reflection package?
Explain 5 io best practices?
Is it possible to declare abstract class as final?What happens if we do so?
What do the thread?class methods run() and start() do?
Write a regular expression to validate a password. A password must start with an alphabet and followed by alphanumeric characters; its length must be in between 8 to 20.
What does singleton mean in java?
Name container classes in java programming?
How many bits does a boolean take?
What does system.gc() and runtime.gc() methods do?