For http://stackoverflow.com/q/34496890/4856258

TestMap.java

import java.util.HashMap;
import java.util.Map;
import java.util.function.Consumer;

public class TestMap<E> {
    public void mapMethod(Consumer<? super E> defaultConsumer) {
        Map<Object, Consumer<? super E>> map = new HashMap<>();
        Consumer<? super E> consumer = map.entrySet()
            .stream()
            .filter(x -> true)
            .map(Map.Entry::getValue)
            .findAny()
            .orElse(defaultConsumer);
    }
}