What programs use java?
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Why is inheritance used in java?
What is the purpose of encapsulation?
What is fail first in java?
Why static functions are used?
Is null a value?
What is singleton class and how can we make a class singleton?
I have a sorting issue with a Hashmap. My constraint is that I MUST use the Hashmap and work with existing code. I do a database query and place the results in a Hashmap. When I iterate thru the Hashmap, it loses the original alphabetical sorting done by the database. So, my problem is that I must sort the results coming out of the Hashmap which is then placed into another class.
What is join () in java?
Can we create an object if a class doesn't have any constructor ( not even the default provided by constructor ) ?
What does || || mean in math?
What are thread groups?
Which is best ide for java?
Core Java 
