What is the main use of java?
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Why do we need wrapper classes?
Explain the different forms of polymorphism?
What is a protected class in java?
How to use scanner in java?
Can u overload main()method.Give with example.
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Why singleton class is used in java?
What is finally in Java?
What is the difference between abstract class and interface?
What is difference between hashset and hashmap in java?
What are the types of classes in java?
How do you sort in ascending order in java?
What is emant by API? is it related to java only or it is common for all OOPS supporting language?