code: public static String upperWord(CharSequence cs, char c) {
          StringBuilder sb = new StringBuilder();
          int len = cs.length();
          for (int i = 0; i < len; i++) {
              char ch = cs.charAt(i);
              if (ch == c) {
                  do {
                      i++;
                      if (i >= len)
                          return sb.toString();
                      ch = cs.charAt(i);
                  } while (ch == c);
                  sb.append(Character.toUpperCase(ch));
              } else {
                  sb.append(ch);
              }
          }
          return sb.toString();
      }
docs: 将一个字符串某一个字符后面的字母变成大写，比如
  <p>
  
  <pre>
  upperWord("hello-world", '-') => "helloWorld"
  </pre>
  
  @param cs
  字符串
  @param c
  分隔符
  @return 转换后字符串