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求空格分割的英文句子中，最大单词长度。例如:“this is a word”，最大单词长度为4。要求:不能用 split 函数对字符串进行切分，算法复杂度为o(n)

public class MaxWordLength {  public static int maxWordLength(String sentence) {  if (sentence == null || sentence.isEmpty()) {  return 0;  }  int maxLength = 0;  int currentLength = 0;  for (int i = 0; i < sentence.length(); i++) {  char c = sentence.charAt(i);  if (c == ' ') {  // 遇到一个空格，更新最大长度并重置当前长度  if (currentLength > maxLength) {  maxLength = currentLength;  }  currentLength = 0;  } else {  // 不是空格，增加当前单词的长度  currentLength++;  }  return maxLength;  }  public static void main(String[] args) {  String sentence = "this is a word";  int maxLen = maxWordLength(sentence);  System.out.println("Max word length: " + maxLen);  }  
}