Add: new Java interview question on difference between final, finally, and finalize()

[vardhan30016]

Summary

Added a new interview question to the README explaining the difference between final, finally, and finalize() in Java.

Details

• Added the new question and detailed explanation in the same format as existing ones.
• Included clear examples for each keyword:
  • final keyword usage with variables, methods, and classes.
  • finally block demonstration in exception handling.
  • finalize() method example showing its purpose before garbage collection.
• Followed the structure and markdown consistency of other questions.

Purpose

This addition helps learners easily understand one of the most frequently asked Java interview questions and clears up common confusion between these three similar-sounding concepts.

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[sudheerj]

@vardhan30016 Thanks for PR. Your contributions are welcome.