import java.util.Arrays; | |
import java.util.List; | |
class FunctionReferenceTest { | |
public static void main(String[] args) { | |
List<String> strings = Arrays.asList(); | |
int sum = strings.stream().mapToInt(CharSequence::length).sum(); | |
List<? extends CharSequence> sequences = strings; | |
sum = sequences.stream().mapToInt(CharSequence::length).sum(); | |
} | |
} |