Can we extend a class with private constructor?
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Which is faster string or stringbuilder?
Why vector class is used?
A non-static inner class may have object instances that are associated with instances of the class’s outer class. A static inner class does not have any object instances.
What is formatted output in java?
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How does sublist works in java?
What are inbuilt functions?
What is a package?
define System.out.println(); what is the meaning!
What are different types of constants?
What are the main concepts of oops in java?
Give me some null interfaces in java?