What is the main use of generics in java?
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Is it possible to declare abstract class as final?What happens if we do so?
how can you retrive information from database by using hashmap/arraylist ,plz explain with example briefly?
FOR EXAMPLE WE R HAVING TWO LIST ELEMENTS ..BOTH LISTS CONTAINS ID,NAME,PLACE ..I NEED TO COMPARE BOTH IDS IN TWO LISTS,IF ID'S R SAME MEANS WE HAVE ADD THE DETAILS(LIKE NAME,PLACE) TO MAP...HOW IS POSSIBLE ?CAN ANY ONE SUGGEST?
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
What is a flag variable?
What is a map in java?
What is a method in programming?
What is purpose of keyword void?
Can you add null to a list java?
Is main is a keyword?
What are static methods?
What is array length in java?
Core Java 
