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  1. Why can't a Java class be both abstract and final?

  2. How many types of memory areas are allocated by JVM in java?

  3. How to run a JAR file through command prompt in java?

  4. Can Enum extend any class in java?

  5. How can we map multiple date formats using Jackson in Java?

  6. What are the restrictions imposed on a static method or a static block of code in java?

  7. How to handle EOFException in java?

  8. What can cause a Cannot find symbol error in java?

  9. What are the key steps in read/write from/to a URL connection in java?

  10. How to send data over remote method in java?

  11. How to make an ArrayList read only in Java?

  12. How to read data from user using the Console class in Java?

  13. How to remove an element from ArrayList or, LinkedList in Java?

  14. How to convert LinkedList to Array in Java?

  15. Remove all non-alphabetical characters of a String in Java?

  16. How many ways are there to convert an Array to ArrayList in Java?

  17. In how many ways you can retrieve the elements of a collection in Java?

  18. How to Sort a String in Java alphabetically in Java?

  19. Is it possible to override toString method in an array using Java?

  20. Can we override only one method while implementing Java interface?
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