What are class and object?
How to call a function of a class without creating an object?
What is Encapsulation, Abstraction?
What is Abstract class and Interface?Difference b/w them?
What is polymorphism?
Difference between list and set?
What is HashMap?
Difference between Array and ArrayList?
How to synchronize collection classes?
How to reverse a string?write code
How to Verify palindrome or not?
what is inheritance?
What is overloading and overriding?
Difference between normal method and static method?
Difference between String and StringBuffer?
Why main() is declared as static?
Difference between while and do-while?
What is the use of sleep()?
What is Exception?How to handle Exceptions?
How to find duplicate characters from a given string?
IMP concepts in JAVA for interview
1)String class and its functions
2)Collections
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