Java 如何解决MathCalculationException的异常问题？

在除法函数中抛出了一个MathCalculationException，但在控制台中它显示了算术异常，我想显示算术异常

 class OverFlowException extends RuntimeException
  class UnderFlowException extends RuntimeException
  class MathCalculationException extends Exception("Division by 0")
  object PocketCalculator{
    def add(x: Int, y: Int): Int = {
      val result = x+y
      if( x > 0 && y > 0 && result < 0 ) throw  new OverFlowException
      else if (x < 0 && y <0 && result > 0) throw  new UnderFlowException
      else result
    }
    def subtract(x: Int, y: Int):Int = {
      val result = x - y
      if(x > 0 && y <0 && result < 0 ) throw  new OverFlowException
      else if (x < 0 && y > 0 && result > 0) throw  new UnderFlowException
      else result
    }
    def multiply(x: Int, y: Int): Int = {
      val result = x * y
      if( x > 0 && y > 0 && result < 0) throw new OverFlowException
      else if (x < 0 && y < 0 && result < 0) throw new OverFlowException
      else if ( x < 0 && y > 0 && result > 0) throw new UnderFlowException
      else if( x > 0 && y < 0 && result > 0) throw new UnderFlowException
      else result
    }
    def divide(x: Int, y: Int): Int = {
      val result = x/y
      if(y == 0) throw new MathCalculationException
      else result
    }

  }
  // println(PocketCalculator.add(Int.MaxValue, 9))
  println(PocketCalculator.divide(0, 0))

预期：异常$MathCalculationException

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实际：算术异常：/by zero

我已对您的代码稍加注释：

def divide(x: Int, y: Int): Int = {
  val result = x/y // ArithmeticException raised here
  if(y == 0) throw new MathCalculationException // never reached
  else result
}

您可以改为：

def divide(x: Int, y: Int): Int = {
  if(y == 0) throw new MathCalculationException
  x/y
}

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首先除以val result=x/y，然后检查y的值（如果y==0），使用lazy val或更改检查顺序（不需要结果）。在else处进行运算+、-、*，或/运算。