private static String getBookByNumber(String[] books)???throws Exception {??while (true) {???System.out.println("輸入圖書序號(hào)：");???try {????//獲取輸入的圖書序號(hào)（數(shù)組下標(biāo)）????int index = inputCommand();????//若返回值為-1????if(index == -1){?????System.out.println("命令輸入錯(cuò)誤！請根據(jù)提示輸入數(shù)字命令！");?????continue;????}????//若不出現(xiàn)”數(shù)組下標(biāo)越界異常“，則返回相應(yīng)位置的圖書????String book = books[index];????return book;???} catch (ArrayIndexOutOfBoundsException e) {????//輸入的序號(hào)不存在（引發(fā)”數(shù)組下標(biāo)越界異?！埃?，則拋出”圖書不存在異?！????Exception bookNotExists = new Exception("圖書不存在！");????bookNotExists.initCause(e);????throw bookNotExists;???}??}?}