代码优化： public T V MapString MapString V convertMultistageMapByFunction final MapString MapString ListT computeResultNameGroup final Function super MapEntryString ListT extends V value

public <T, V> Map<String, Map<String, V>> convertMultistageMapByFunction( final Map<String, Map<String, List>> computeResultNameGroup, final Function<? super Map.Entry<String, List>, ? extends V> valueMapper) { return computeResultNameGroup.entrySet().stream() .collect(Collectors.toMap( Map.Entry::getKey, e -> e.getValue().entrySet().stream() .collect(Collectors.toMap( Map.Entry::getKey, valueMapper, (o, n) -> o )), (o, n) -> o ));