Adam Amin :
I have the following list of lists List<List<Integer>> dar = new ArrayList<List<Integer>>();:
[[0], [1, 2, 0], [2, 1, 0], [5, 0]]
I want to check whether the integer 5 is in any of the lists. If I use if(dar.contains(5)), it will return false.
What can I do to check whether an integer exists in any of the lists?
GBlodgett :
Iterate over the List of List's and then call contains:
for(List<Integer> list : dar) {
if(list.contains(5)) {
//...
}
}
Or use Streams:
boolean five = dar.stream().flatMap(List::stream).anyMatch(e -> e == 5);
//Or:
boolean isFive = dar.stream().anyMatch(e -> e.contains(5));
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