Vertical Text Function in Java

A Challenge from Sloth Bytes

One of my favorite newsletters is Sloth Bytes. Wanted to do this week’s challenge:

Solution:

import java.util.*;

public class VerticalText {

    public static List<List<String>> vertical_txt(String input) {
        String[] words = input.split(" ");

        // Step 1: find max word length
        int maxLen = 0;
        for (String word : words) {
            maxLen = Math.max(maxLen, word.length());
        }

        List<List<String>> result = new ArrayList<>();

        // Step 2: build vertical rows
        for (int i = 0; i < maxLen; i++) {
            List<String> row = new ArrayList<>();

            for (String word : words) {
                if (i < word.length()) {
                    row.add(String.valueOf(word.charAt(i)));
                } else {
                    row.add(" ");
                }
            }

            result.add(row);
        }

        return result;
    }

    public static void main(String[] args) {
        List<List<String>> output = vertical_txt("Coffee time");

        for (List<String> row : output) {
            System.out.println(row);
        }
    }
}

CodeHS has a great sandbox for Java, where I tested this code.