What's the base class in java from which all classes are derived?
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What are different data structures in java?
What are abstract methods in java?
If an application has multiple classes in it, is it okay to have a main method in more than one class?
Difference between operator overloading and function overloading
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What are the approaches that you will follow for making a program very efficient?
Tell me are there implementations for sorting and searching in the java libarary?
Explain wait() method of object class ?
What is abstraction with strong example program? (not a general program)
why String class is immutable.
Give us a program to check for parenthesis matching using stack.
what is polymorphism?
When do I need to use reflection feature in java?