Java 8 streams中的if-else if-else功能

import java.util.Arrays;
import java.util.List;
import java.util.Optional;

public class StreamExample {
    public static void main(String[] args) {
        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
        
        Optional<String> result = numbers.stream()
            .flatMap(StreamExample::checkConditions)
            .findFirst();
        
        String output = result.orElse("No condition satisfied");
        System.out.println(output);
    }
    
    public static Stream<String> checkConditions(Integer number) {
        return Stream.of(
            condition1(number),
            condition2(number),
            condition3(number)
        ).filter(Optional::isPresent)
         .map(Optional::get);
    }
    
    public static Optional<String> condition1(Integer number) {
        if (number % 2 == 0) {
            return Optional.of("Even");
        }
        return Optional.empty();
    }
    
    public static Optional<String> condition2(Integer number) {
        if (number % 3 == 0) {
            return Optional.of("Divisible by 3");
        }
        return Optional.empty();
    }
    
    public static Optional<String> condition3(Integer number) {
        if (number % 5 == 0) {
            return Optional.of("Divisible by 5");
        }
        return Optional.empty();
    }
}