java源碼-求這個題目代碼，不會寫啊⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

求這個題目代碼，不會寫啊⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

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最佳回答：

 public class StrMirror {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        System.out.println("請輸入字符串:");
        String str = sc.next();
        System.out.println("str = " + str);
        //String revStr = reverse1(str);
        //System.out.println("revStr = " + revStr);

        System.out.println("請輸入逆轉次數：");

        int  num = sc.nextInt();

        for (int i = 0; i < num; i ++) {
            str = str + reverse1(str);
        }

        System.out.println("mirror str = " + str);

    }

    public static String reverse1(String str) {
        int length = str.length();
        if (length <= 1) {
            return str;
        }
        String left = str.substring(0, length / 2);
        String right = str.substring(length / 2, length);
        return reverse1(right) + reverse1(left);
    }

}