我试图让我的而while块正常运行。内附的try and catch块仅能部分工作。我希望在输入Int以外的内容时捕获异常(InputMismatchException
),并且在除以零时也捕获异常。如果发生任何捕获,则目的是借助do while循环返回到重试状态。当前,它适用于ArithmeticException
,但不适用于InputMismatchException
。当我输入字符而不是Int时,它似乎不停地循环。请帮忙。我不明白为什么一个有效,而另一个无效。
int div;
boolean check = true;
while (check) {
boolean result = true;
do {
try {
System.out.println("The following operation will divide the first number by the second.");
System.out.println("Enter first number.");
example.a = user_input.nextInt();
System.out.println("Enter second number.");
example.b = user_input.nextInt();
div = example.div();
System.out.println("The result of this division is " + div);
result = true;
} catch (InputMismatchException e) {
System.out.println("That is not a number. Please try again.");
result = false;
} catch (ArithmeticException e) {
System.out.println("Division by zero.");
result = false;
}
} while (result = true);
最佳答案
获取InputMismatchException
不会跳过错误的数据,因此下一次对nextInt()
的调用将因相同的原因而失败。您应该尝试在捕获中调用nextLine()
:
} catch (InputMismatchException e) {
System.out.println("That is not a number. Please try again.");
result = false;
user_input.nextLine(); // Advance past the bad stuff
}