Streams - Java 8 Lambdas - page 41

int int totalMembers = 0 ;

for

for ( Artist artist : artists ) {
Stream < Artist > members = artist . getMembers ();
totalMembers += members . count ();

}

3. Evaluation . Take a look at the signatures of these Stream methods. Are they eager or
lazy?

a. boolean anyMatch(Predicate<? super T> predicate);

b. Stream<T> limit(long maxSize);

4. Higher-order functions . Are these Stream functions higher order, and why?

a. boolean anyMatch(Predicate<? super T> predicate);

b. Stream<T> limit(long maxSize);

5. Pure functions. Are these lambda expressions side effect-free, or do they mutate state?

x -> x + 1

Here's the example code:

AtomicInteger count = new new AtomicInteger ( 0 );

List < String > origins = album . musicians ()
. forEach ( musician -> count . incAndGet ();)

a. The lambda expression passed into forEach in the example.

6. Count the number of lowercase letters in a String (hint: look at the chars method on
String ).

7. Find the String with the largest number of lowercase letters from a List<String> .
You can return an Optional<String> to account for the empty list case.