简洁代码（重写数组sort函数，字符串比较，）

        public String[] reorderLogFiles(String[] logs) {
            // 数组排序，重写排序方法
            Arrays.sort(logs, (log1, log2) -> {
                String[] split1 = log1.split(" ", 2);
                String[] split2 = log2.split(" ", 2);
                boolean isDigit1 = Character.isDigit(split1[1].charAt(0));// 标准库函数判断是数字还是字符
                boolean isDigit2 = Character.isDigit(split2[1].charAt(0));
                if (!isDigit1 && !isDigit2) {
                    int cmp = split1[1].compareTo(split2[1]);
                    if (cmp != 0)
                        return cmp;
                    return split1[0].compareTo(split2[0]);
                }
                return isDigit1 ? (isDigit2 ? 0 : 1) : -1;
            });
            return logs;
        }