How does hashmap work in java ?
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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
When the constructor of a class is invoked?
How do you square a number in java?
Can a final variable be null?
Which collection object is faster to retrieving the data and inserting the data into it.
2 Answers Jamcracker, Virtusa,
What are the principle concepts of oops?
Difference between Superclass and Subclass?
What do you understand by the term polymorphism?
Difference between final and effectively final ?
How we get some middle records in one table?
What is application system?
How are multiple inheritances done in Java?
Core Java 
