Excel表列名称

// Solution in Java using Java Stream
// Problem: Convert a given column number to its corresponding Excel column name.
// Approach: Similar to the basic Java solution but demonstrates a more functional approach using streams and StringBuilder.
// Note: This problem doesn't inherently benefit much from Stream API, but we use it to showcase a different style.
 
import java.util.stream.IntStream;
 
public class SolutionStream {
    public String convertToTitle(int columnNumber) {
        StringBuilder result = new StringBuilder();
        IntStream.iterate(columnNumber, num -> num > 0, num -> (num - 1) / 26)
                .forEach(num -> result.append((char) ((num - 1) % 26 + 'A')));
        return result.reverse().toString(); // Reverse to get the correct column title
    }
}