Java Scanner 怎么判断用户输入是否为数字
Integer age = null; boolean flag = true; Scanner scanner = new Scanner(); do { try { age = scanner.nextInt(); flag = false; } catch (Exception e){ // 把上一条的不规范数据删去(相当于指针下移) scanner.next(); System.out.println("请输入数字:"); } }while (flag);