Which class should you use to obtain design information
about an object
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What is an abstract class and what is it’s purpose?
How many threads can I run java?
Can multiple catch statements be used in exceptions ?
Is there is any error if you have multiple main methods in the same class?
Difference between overloading and overridding?
What is an enumeration?
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.
How to add two numbers with out using Arithmetic , union operators in java....? But we can use bitwise operators... but how...?
Explain notify() method of object class ?
What is difference between overloading and overriding?
What is meant by the value of a variable?
what is server side caching?
Core Java 
