一月有多少天

/*
 * Problem: Determine the number of days in January
 * Approach using Java Streams: 
 * - Although streams are typically used for processing collections, we can demonstrate a basic example here.
 * - January always has 31 days, so we will return a single value of 31 using a stream.
 */
import java.util.stream.IntStream;

public class JanuaryDaysStream {
    public static int getDaysInJanuary() {
        return IntStream.of(31).findFirst().getAsInt(); // January always has 31 days
    }
    public static void main(String[] args) {
        System.out.println("January has " + getDaysInJanuary() + " days.");
    }
}