Simple way to compare 2 ArrayLists

Question

I have 2 arraylists of string object.

List sourceList = new ArrayList();
List destinationList = new ArrayList

        

Answer 1

Convert Lists to Collection and use removeAll

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


    List sourceList = new ArrayList(listOne);
    List destinationList = new ArrayList(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 list = new ArrayList(Arrays.asList("a","b", "c", "d", "e", "f", "g"));

    List sourceList = new ArrayList(list);
    List destinationList = new ArrayList(list);

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

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


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

Output:

[b]
[boo]