How to check whether the elements of an ArrayList are all contained in another ArrayList

Question

How can I easily check to see whether all the elements in one ArrayList are all elements of another ArrayList?

Admittance

Answer 1

Use Collection.containsAll():

boolean isSubset = listA.containsAll(listB);

Isma

is there anything available so that a new array is generated containing all data that's shared in listA and listB? Object[] subset = listA.shared(listB) – Heliogravure

Set common = new HashSet(listA); common.retainAll(listB); // now "common" contains only the common elements – Indian

Is there a way to check for the order of the elements as well? I tried this and it was true even though I'd changed the order of the elements. Is there a way to do what I'd like to do? – Martino

How to check if ATLEAST ONE of the elements of a String ArrayList are contained in another String ArrayList?? – Passionless

As this is case sensitive, how to validate for case insensitive lists? – Exergue

Answer 2

There is a containsAll method in all collections.

Cordey