Simple way to compare 2 ArrayLists

by

Convert Lists to Collection and use removeAll

    Collection<String> listOne = new ArrayList(Arrays.asList("a","b", "c", "d", "e", "f", "g"));
    Collection<String> listTwo = new ArrayList(Arrays.asList("a","b",  "d", "e", "f", "gg", "h"));


    List<String> sourceList = new ArrayList<String>(listOne);
    List<String> destinationList = new ArrayList<String>(listTwo);


    sourceList.removeAll( listTwo );
    destinationList.removeAll( listOne );



    System.out.println( sourceList );
    System.out.println( destinationList );

Output:

[c, g]
[gg, h]

[EDIT]

other way (more clear)

  Collection<String> list = new ArrayList(Arrays.asList("a","b", "c", "d", "e", "f", "g"));

    List<String> sourceList = new ArrayList<String>(list);
    List<String> destinationList = new ArrayList<String>(list);

    list.add("boo");
    list.remove("b");

    sourceList.removeAll( list );
    list.removeAll( destinationList );


    System.out.println( sourceList );
    System.out.println( list );

Output:

[b]
[boo]

More Related Contents:

  1. How to arrange the datas to display in array by given string of days in java?
  2. How to create a Java ArrayList in C
  3. ArrayList, Loop and requisite if can not work that i want – Java 11
  4. Why does my ArrayList contain N copies of the last item added to the list?
  5. How do I remove repeated elements from ArrayList?
  6. How to avoid “ConcurrentModificationException” while removing elements from `ArrayList` while iterating it? [duplicate]
  7. Why do I get an UnsupportedOperationException when trying to remove an element from a List?
  8. How to sort a List/ArrayList?
  9. Convert list to array in Java [duplicate]
  10. Java List.add() UnsupportedOperationException
  11. In Java how do you sort one list based on another?
  12. How to randomize two ArrayLists in the same fashion?
  13. What is the difference between List and ArrayList? [duplicate]
  14. List versus ArrayList as reference type?
  15. Modifier static is only allowed in constant variable declarations
  16. What is a List vs. an ArrayList? [duplicate]
  17. Removing Duplicate Values from ArrayList
  18. Why can’t you have a “List” in Java? [duplicate]
  19. ArrayList vs LinkedList from memory allocation perspective
  20. Finding out if a list of Objects contains something with a specified field value?
  21. new ArrayList() failing in Java
  22. How to remove common values from two array lists
  23. Convert ArrayList to String[] array [duplicate]
  24. Variable length (Dynamic) Arrays in Java
  25. How do I declare a 2D String arraylist?
  26. How can I slice an ArrayList out of an ArrayList in Java?
  27. How can I convert ArrayList to ArrayList?
  28. casting Arrays.asList causing exception: java.util.Arrays$ArrayList cannot be cast to java.util.ArrayList
  29. Time complexity of contains(Object o), in an ArrayList of Objects
  30. Better way to find index of item in ArrayList?

Leave a Comment