在try / catch中捕获异常后继续执行循环

将 try / catch 放入 while循环中 ：

    while (option != 0) {        final Scanner keyb = new Scanner(System.in);        System.out.println("");        try { switch (option) { }        } catch (Exception InputMismachException) { System.out.println("nPlease Enter a Valid Numbern"); option = menuSystem();        }    }