How to remove duplicates from a list?

by

Assuming you want to keep the current order and don’t want a Set, perhaps the easiest is:

List<Customer> depdupeCustomers =
    new ArrayList<>(new LinkedHashSet<>(customers));

If you want to change the original list:

Set<Customer> depdupeCustomers = new LinkedHashSet<>(customers);
customers.clear();
customers.addAll(dedupeCustomers);

More Related Contents:

  1. How do I remove repeated elements from ArrayList?
  2. Is there a no-duplicate List implementation out there?
  3. I need to create a list that has both colums 1 and 2 equal [closed]
  4. How to sort a List/ArrayList?
  5. How do you cast a List of supertypes to a List of subtypes?
  6. How to randomize two ArrayLists in the same fashion?
  7. How can I sort a List alphabetically?
  8. How to convert a Map to List in Java?
  9. How do I convert a Map to List in Java?
  10. How to make a new List in Java
  11. Define a fixed-size list in Java
  12. Difference between Arrays.asList(array) and new ArrayList(Arrays.asList(array))
  13. Java – generate Random range of specific numbers without duplication of those numbers – how to?
  14. How to copy Java Collections list
  15. Java List Sorting: Is there a way to keep a list permantly sorted automatically like TreeMap?
  16. How to shuffle an ArrayList [duplicate]
  17. How to search in a List of Java object
  18. How to get a reversed list view on a list in Java?
  19. Print array without brackets and commas
  20. Create a List of primitive int?
  21. How to flatten all items from a nested Java Collection into a single List?
  22. ArrayList vs LinkedList from memory allocation perspective
  23. How to remove common values from two array lists
  24. Performance and Memory allocation comparison between List and Set
  25. How can I get the size of an array, a Collection, or a String in Java?
  26. How to initialize HashSet values by construction?
  27. Performance considerations for keySet() and entrySet() of Map
  28. Sort List in reverse in order
  29. What is a List vs. an ArrayList? [duplicate]
  30. Is LinkedList thread-safe when I’m accessing it with offer and poll exclusively?

Leave a Comment