java: reduce vs anyMatch vs contains

Question

 List<Boolean> results = new ArrayList<>();
 results.add(true);
 results.add(true);
 results.add(true);
 results.add(false);

 if (results.contains(false)) {
     System.out.println(false);
 } else {
     System.out.println(true);
 }

 System.out.println(results.stream().reduce((a, b) -> a && b).get());
 //System.out.println(!results.stream().anyMatch(a -> a == false));
 System.out.println(!results.stream().anyMatch(a -> !a));

OUTPUT:
false
false
false

FYI, the results are a result of a map+collect op

List<Job> jobs;
List<Boolean> results = job.stream().map(j -> j.ready()).collect(Collector.toList())

If I choose either reduce or anyMatch, I don't have to collect the results from map operation.

From results which is a list of boolean, I just want to return false if there is at least one false.

I can do it via reduce or anyMatch. I kinda don't like Optional from reduce, and I kinda don't like that I have to negate anyMatch

Are there any pros/cons for using either?

Answer 1

It appears that the only reason you are collecting the booleans into the list is so you can check if some are false:

If I choose either reduce or anyMatch, I don't have to collect the results from map operation [...] I just want to return false if there is at least one false.

If this is the case, then you definitely should consider the straightforward stream-based approach:

return jobs.stream().allMatch(Job::ready);