Merge Strings Alternately LeetCode solution in Java

1
class Solution {
2
  public String mergeAlternately(String word1, String word2) {
3
    StringBuilder sb = new StringBuilder();
4
    int lenmax = Math.max(word1.length(), word2.length());
5
    for (int i = 0; i <= lenmax - 1; i++) {
6
      if (i < word1.length()) sb.append(word1.charAt(i));
7
      if (i < word2.length()) sb.append(word2.charAt(i));
8
    }
9
    return sb.toString();
10
  }
11
}