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import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.stream.Collector;
class Stuff {
public enum Type { A }
private final int value;
private final Type type;
public Stuff(int value, Type type) {
this.value = value;
this.type = type;
}
public int getValue() {
return value;
}
public Type getType() {
return type;
}
}
class FakeErrors {
{
Collector<Stuff, ?, Map<Stuff.Type, Optional<Stuff>>> collector =
groupingBy(Stuff::getType,
reducing((d1, d2) -> {
boolean b = d1.getValue() > d2.getValue();
return d1;
}));
}
public static <T> Collector<T, ?, Optional<Stuff>> reducing(BinaryOperator<T> op) {
return null;
}
public static <T, K, A, D>
Collector<T, ?, Map<K, D>> groupingBy(Function<? super T, ? extends K> classifier,
Collector<? super T, A, D> downstream) {
return null;
}
}
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