Q1. What is Java? and it is 100% object oriented?

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Q2. What is Class and Object in Java?

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Q3. What kind of variables are there in Java?

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Q4. What is the difference between C++ and Java?

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Q5. What are the Java packages used for?

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Q6. The static vs instace in Java?

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Q7. What is the method overloading and overriding in Java?

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Q8. Procedural Oriented Programming Language vs Object Oriented Programming Language.

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Q9. How many ways we can create object for the class?

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Q10. What static block and instance block in Java?

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Q11. What is auto boxing and unboxing in Java?

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Q12. What is exception in Java?

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Q13. How to handle exceptions in Java?

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Q14. How to deal with unknown exceptions in Java?

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Q15. How to create custom exceptions in Java?

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Q16. How many ways we can create Thread in Java?

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Q17. What is the default thread name and priority in Java?

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Q18. How to justify by default Java based applications are multithreaded?

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Q19. How to reverse a String without using inbuilt methods in a Java?

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Q20. How to convert immutable object into mutable object?

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Q21. What is transient and volatile keywords in Java?

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Q22. What is Array in Java?

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Q23. What is collection in Java?

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Q24. What is List in collection API?

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Q25. What is Set in collection API?

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Q26. Map in Java collection API?

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