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?

score 48 · Accepted Answer · answered Apr 30 '09 at 18:34

48

boolean isSubset = listA.containsAll(listB);

answered Apr 30 '09 at 18:34

Dan Lew

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) – Someone Somewhere May 24 '11 at 23:34
2

Set common = new HashSet(listA); common.retainAll(listB); // now "common" contains only the common elements – JimN Aug 02 '11 at 02:04
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? – CodingInCircles Apr 02 '13 at 20:39
How to check if ATLEAST ONE of the elements of a String ArrayList are contained in another String ArrayList?? – Shikhar Mar 18 '19 at 04:50
1

As this is case sensitive, how to validate for case insensitive lists? – Brooklyn99 Nov 06 '19 at 23:21

score 2 · Answer 2 · answered Apr 30 '09 at 18:39

2

There is a containsAll method in all collections.

answered Apr 30 '09 at 18:39

Uri

2 Answers2