What is tree node in java?
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what is main purpose of abstract class?
What is the difference between abstract classes and interfaces?
Why hashset is used in java?
Who is the owner of java?
class A{ class B{ } } in which name u save the file,its the program compile?
How many bits is a char?
What is the difference between choice and list?
Explain oops concepts in detail?
What is output buffer?
What is a method vs function?
Can I extend singleton class in java?
What is the console in java?