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import java.util.*;
import java.util.function.Predicate;
abstract class Test {
public long countTweetsLongerThan(int numberOfChars, final List<String> tweetList) {
//numberOfChars = 100; //TODO uncomment to show it must be effectively final
long totalByFor = 0;
for (String tweet : tweetList) {
if (tweet.length() > numberOfChars) {
totalByFor++;
}
}
final ArrayList<String> guavaList = newArrayList(filter(tweetList, new Predicate<String>() {
@Override
public boolean test(String tweet) {
return false;
}
}));
final long totalFromGuava = guavaList.size();
final long totalFromLambda = tweetList.stream()
.filter(t -> t.length() > numberOfChars)
.count();
if (totalByFor != totalFromLambda | totalByFor != totalFromGuava) {
throw new RuntimeException("");
}
return totalFromLambda;
}
abstract <E> ArrayList<E> newArrayList(Iterable<? extends E> elements);
abstract <E> ArrayList<E> newArrayList();
abstract <E> ArrayList<E> newArrayList(E... elements);
abstract <T> Iterable<T> filter(Iterable<T> unfiltered, Predicate<? super T> predicate);
abstract <T> Iterable<T> filter(Iterable<?> unfiltered, Class<T> type);
}
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