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What is structure of java heap? What is perm gen space in heap?
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what is difference between class and object?
43 Answers College School Exams Tests, HCL,
What is an object in Java and what are its benefits?
Difference between arraylist and hashset in java?
what is object slice?
What is the difference between this() and super() in java?
How do you declare an array that will hold more than 64KB of data?
What is a void in java?
Which one will take more memory: an int or integer?
How do I know if java is installed?
Why is multiple inheritance not supported in java?
There are 2 different ways to create an object. a)By using keyword "new" b)By using Class.forName ("className").newInstance(); What is the difference between these 2 methods.
Is it safe for adding 10,00,000 records/objects to HashMap?, i.e is it safe to add millions of objects to HashMap?
Core Java 
