private static String getBookByNumber(String[] books)???throws Exception {??while (true) {???System.out.println("輸入圖書序號：");???try {????//獲取輸入的圖書序號（數組下標）????int index = inputCommand();????//若返回值為-1????if(index == -1){?????System.out.println("命令輸入錯誤！請根據提示輸入數字命令！");?????continue;????}????//若不出現”數組下標越界異?！埃瑒t返回相應位置的圖書????String book = books[index];????return book;???} catch (ArrayIndexOutOfBoundsException e) {????//輸入的序號不存在（引發”數組下標越界異?！埃瑒t拋出”圖書不存在異?！????Exception bookNotExists = new Exception("圖書不存在！");????bookNotExists.initCause(e);????throw bookNotExists;???}??}?}