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  1. Can an interface in Java extend multiple interfaces?

  2. How to wrap a JSON using flexjson in Java?

  3. Remove Leading Zeroes from a String in Java using regular expressions

  4. Removing leading zeros from a String using apache commons library in Java

  5. Java methods to convert Double to String

  6. Converting String to StringBuilder in Java

  7. Converting a StringBuilder to String in Java

  8. What is the purpose of the flush() method of the BufferedWriter class in java?

  9. How to create a directory hierarchy using Java?

  10. Byte Streams in Java

  11. Character streams in Java

  12. Reading data from keyboard using console class in Java

  13. Explain packages in Java

  14. Temporary files in Java

  15. Difference between the list() and listFiles() methods in Java

  16. How to convert a JSON to Java Object using the Jackson library in Java?

  17. How to compress a file in Java?

  18. How to un-compress a file in Java?

  19. Difference between peek(), poll() and remove() method of Queue interface in java?

  20. How to remove the redundant elements from an ArrayList object in java?
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