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What is hashtable and explain features of hashtable?
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When we r go to abstract class and when we go to Interface? i have confusion this question while in interview plz clarify
Give some features of interface?
what is main purpose of interface?
2 Answers Accenture, HCL, NIIT,
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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 a programmer confirms that the data submitted has been succesfully inserted into the database(either oracle or my sql).. How a programmer confirm if there is any problem with the program he wrote for insertion
Can main() method in java can return any data?
Can arraylist hold different types java?
Core Java 
