Quivalent method to array_diff() in JAVA

Question

In PHP there is the method array_diff() which verifies values of two arrays and returns the items referring to the difference between them. For example:

$arrExclusion = array('as', 'coisas', 'acontece', 'no', 'tempo', 'certo');

$arr = array('tudo', 'as', 'coisas' 'acontece', 'me', 'é', 'no', 'lícito',
'mas', 'seu', 'nem', 'tudo', 'tempo', 'me', 'convém', 'certo' );

$new_array = array_diff($arr, $arrExclusion);

The values of array $new_array evening:

''everything', 'me', 'me', 'lawful', 'but', 'not', 'all', 'me', 'it suits'

Is there any method equivalent to array_diff() in JAVA? If yes, which one? If not, how could I perform this procedure?

Answer 1

You can use the library Commons Collections the method removeAll class Collectionutils removing the elements of one array from another, thus:

List<String> arrExclusion = Arrays.asList("as", "coisas", "acontece", "no", "tempo", "certo");

List<String> arr = Arrays.asList("tudo", "as", "coisas", "acontece", "me", "é", "no", "lícito","mas", "seu", "nem", "tudo", "tempo", "me", "convém", "certo");

Collection<String> new_array = CollectionUtils.removeAll(arr, arrExclusion);

Generating the following result:

[everything, me, is, lawful, but, you, not everything, me, it suits]

Answer 2

Arrays does not have a method that performs the diff among arrays.

To do this we can do the following:

String[] s1 = {"ram", "raju", "seetha"};
String[] s2 = {"ram"};
List<String> s1List = new ArrayList(Arrays.asList(s1));
for (String s : s2) {
  if (s1List.contains(s)) {
    s1List.remove(s);
  }
  else {
    s1List.add(s);
  }
}

demonstration

described in the equivalent question in English: https://stackoverflow.com/questions/2220752/find-string-array-difference-in-java