Java-8: boolean primitive array to stream?

Given boolean[] foo use

Stream<Boolean> stream = IntStream.range(0, foo.length)
                                  .mapToObj(idx -> foo[idx]);

Note that every boolean value will be boxed, but it's usually not a big problem as boxing for boolean does not allocate additional memory (just uses one of predefined values - Boolean.TRUE or Boolean.FALSE).

of course you could create a stream directly

Stream.Builder<Boolean> builder = Stream.builder();
for (int i = 0; i < foo.length; i++)
  builder.add(foo[i]);
Stream<Boolean> stream = builder.build();

…or by wrapping an AbstractList around foo

Stream<Boolean> stream = new AbstractList<Boolean>() {
  public Boolean get(int index) {return (foo[index]);}
  public int size() {return foo.length;}
}.stream();

You can use Guava's Booleans class:

Stream<Boolean> stream = Booleans.asList(foo).stream();

This is a pretty efficient way because Booleans.asList returns a wrapper for the array and does not make any copies.