Java Check if two lists are mutually exclusive

Question

Ok, I have List a and List b

is there a way to check that no value exist between the two?

List a // 1,2,4,5
List B // 1,6,7,8

Between both list // 1 FAILURE

Answer 1

Collections.disjoint(list1, list2)

returns true if they have no elements in common.

Answer 2

Use Collections.disjoint.

Returns true if the two specified collections have no elements in common

boolean hasCommonElements = Collections.disjoint(listA, listB);