// Calls the Combiner object on each element to combine
// it with a running result, which is finally returned:
public static <T> T reduce(Iterable<T> seq, Combiner<T> combiner) {
Iterator<T> it = seq.iterator();
if (it.hasNext()) {
T result = it.next();
while (it.hasNext()) result = combiner.combine(result, it.next());
return result;
}
// If seq is the empty list:
return null; // Or throw exception
}
public static void main(String[] args) {
SortedSet<String> sortedSet = new TreeSet<String>();
Collections.addAll(sortedSet, "one two three four five six seven eight".split(" "));
print(sortedSet);
String low = sortedSet.first();
String high = sortedSet.last();
print(low);
print(high);
Iterator<String> it = sortedSet.iterator();
for (int i = 0; i <= 6; i++) {
if (i == 3) low = it.next();
if (i == 6) high = it.next();
else it.next();
}
print(low);
print(high);
print(sortedSet.subSet(low, high));
print(sortedSet.headSet(high));
print(sortedSet.tailSet(low));
}