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

问题

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

回答1:

Use Collection.containsAll():

boolean isSubset = listA.containsAll(listB);

回答2:

There is a containsAll method in all collections.

来源：https://stackoverflow.com/questions/808394/how-to-check-whether-the-elements-of-an-arraylist-are-all-contained-in-another-a