| import java.util.Map; |
| |
| |
| abstract class Test<Tt> { |
| |
| public Map<String, Long> getNumberOfInstancesForEachWord() { |
| return collect(groupingBy(counting())); |
| } |
| |
| abstract <R> R collect(Collector<? super Tt, R> collector); |
| abstract <Tg, M> Collector<Tg, M> groupingBy(Collector<? super Tg, Long> downstream); |
| abstract <Tc> Collector<Tc, Long> counting(); |
| |
| interface Collector<T, R> {} |
| } |
| |
| abstract class Test1<Tt> { |
| |
| public Map<String, Long> getNumberOfInstancesForEachWord() { |
| return collect(groupingBy(counting())); |
| } |
| |
| abstract <R> R collect(Collector<Tt, R> collector); |
| abstract <Tg, M> Collector<Tg, M> groupingBy(Collector<Tg, Long> downstream); |
| abstract <Tc> Collector<Tc, Long> counting(); |
| |
| interface Collector<T, R> {} |
| } |
| |
| abstract class Test2<Tt> { |
| |
| public Map<String, Long> getNumberOfInstancesForEachWord() { |
| return collect(groupingBy(counting())); |
| } |
| |
| abstract <R> R collect(Collector<Tt, R> collector); |
| abstract <Tg, M> Collector<Tg, M> groupingBy(Collector<? extends Tg, Long> downstream); |
| abstract <Tc> Collector<Tc, Long> counting(); |
| |
| interface Collector<T, R> {} |
| } |
