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  1. How to get first and last elements from ArrayList in Java?

  2. How do we check if a String contains a substring (ignoring case) in Java?

  3. Can a final variable be initialized when an object is created in Java?

  4. How to create a variable that can be set only once but isn't final in Java?

  5. Method to check if a String contains a sub string ignoring case in Java

  6. How to parse for words in a string for a specific word in java?

  7. How do we make my string comparison case insensitive in java?

  8. How to create a JSON using Jackson Tree Model in Java?

  9. How can we create a JSON using JsonGenerator in Java?

  10. How can we serialize a list of objects using flexjson in Java?

  11. How can we convert a JSON array to a list using Jackson in Java?

  12. How to get ArrayList<String> to ArrayList<Object> and vice versa in java?

  13. How do we initialize an array within object parameters in java?

  14. Is it possible to check if a String only contains ASCII in java?

  15. Java String replace(), replaceFirst() & replaceAll() Methods

  16. How to parse Date from String in the format: dd/MM/yyyy to dd/MM/yyyy in java?

  17. Program to replace all the characters in of a file with '#' except a particular word in Java

  18. How to overwrite a line in a .txt file using Java?

  19. How to resolve Could not find or load main class package in Java?

  20. How to read a .txt file with RandomAccessFile in Java?
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