Explain 5 io best practices?
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What is api data?
How do you reverse a word in java?
when asub class inherits a super class and overrides a public method of super class in sub class(public method in super class). why these methods needs to be public in sub class. (otherwise compile time error).
Do you know thread pools?
Explain importance of inheritance in java?
Where is core java used?
what is difference between abstraction and interface?
I have a Person object with 5 variables and I want to store them in a file called Person.txt. What should I do?
class A { private int i; } class B extends A { private int i; } if I create an object of B class what will be the memory of that object.
What do you know about the garbate collector?
Why are parameters used in functions?
Why string is popular hashmap key in java?