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  1. Difference between next() and hasNext() in java collections?

  2. Difference between ArrayList.clear() and ArrayList.removeAll() in java?

  3. How to search for a string in an ArrayList in java?

  4. How to insert an object in an ArrayList at a specific position in java?

  5. What happens when we try to add a duplicate key into a HashMap object in java?

  6. How to avoid ConcurrentModificationException while iterating a collection in java?

  7. What is ArrayIndexOutOfBoundsException in Java?

  8. What is StringIndexOutOfBoundsException in Java?

  9. What is meant by re-throwing exceptions in Java?

  10. Custom exceptions in Java

  11. Convert JSONObject to/from a cookie in Java?

  12. How to auto-increment the property of a JSONObject in Java?

  13. Algorithm to generate positive rational numbers in Java

  14. How to deserialize a JSON string using @JsonCreator annotation in Java?

  15. How to ignore a field of JSON object using the Jackson library in Java?

  16. How to serialize a JSON string to an Output Handler in Java?

  17. How to ignore the multiple properties of a JSON object in Java?

  18. How to rename the properties of JSON using Gson in Java?

  19. When to use @JsonAutoDetect annotation in Java?

  20. Thread Pools in Java
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