What are the advantages of encapsulation in java?
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What is nullpointerexception in java?
when a request is generated from apache tomcat 5.5 and goes to oracle 10g or mysql,,, how the oracle or mysql reads the request as apache is a web server and oracle 10g is application server? when the oracle 10g provides response, how the apche tomcat reads it???
Define interface?
What do you understand by garbage collection in Java? Can it be forced to run?
What is bufferedreader in java?
What is light weight component?
as we know a static method could access static data and static method only. then how could main method call the object of aclass which is not static and other non static data
When do I need to use reflection feature in java?
Why declare Main() method as a static in java ?
What is primitive data type in java?
Is null a string or object in java?
What is dynamic array in java?
Core Java 
