what is the sense of final ArrayList?

by

But what is effect making it’s final?

This means that you cannot rebind the variable to point to a different collection instance:

final List<Integer> list = new ArrayList<Integer>();
list = new ArrayList<Integer>(); // Since `list' is final, this won't compile

As a matter of style, I declare most references that I don’t intend to change as final.

I still can add to ArrayList new elements, remove elements and update it.

If you wish, you can prevent insertion, removal etc by using Collections.unmodifiableList():

final List<Integer> list = Collections.unmodifiableList(new ArrayList<Integer>(...));

More Related Contents:

  1. Removing duplicates from arraylist using set
  2. How to check two array list are same content in same position
  3. Logical disjunction of a list of booleans represented by integers [closed]
  4. ArrayList remove methods [closed]
  5. ArrayList, Loop and requisite if can not work that i want – Java 11
  6. How do I remove repeated elements from ArrayList?
  7. Sorting an ArrayList of objects using a custom sorting order
  8. How does the “final” keyword in Java work? (I can still modify an object.)
  9. How to convert an ArrayList containing Integers to primitive int array?
  10. How does a ArrayList’s contains() method evaluate objects?
  11. Common elements in two lists
  12. Concurrent Modification Exception : adding to an ArrayList
  13. Why should I use the keyword “final” on a method parameter in Java?
  14. ArrayList initial capacity and IndexOutOfBoundsException [duplicate]
  15. Convert ArrayList into 2D array containing varying lengths of arrays
  16. How to efficiently remove all null elements from a ArrayList or String Array?
  17. Count occurrences of words in ArrayList [duplicate]
  18. Java – How Can I Write My ArrayList to a file, and Read (load) that file to the original ArrayList?
  19. Why are all fields in an interface implicitly static and final?
  20. ArrayList filter [duplicate]
  21. Searching in a ArrayList with custom objects for certain strings
  22. java.util.Vector – alternatives
  23. The final local variable cannot be assigned
  24. ArrayList or List declaration in Java
  25. Arrays.asList() of an array
  26. How does ArrayList work?
  27. Better way to find index of item in ArrayList?
  28. Java generics – ArrayList initialization
  29. How to pass ArrayList using putStringArrayListExtra()
  30. What is the difference between ArrayList.clear() and ArrayList.removeAll()?

Leave a Comment