How should I throw a divide by zero exception in Java without actually dividing by zero

Question

I have an I2C device that wants two inputs  a denominator and a numerator  Both are written to separate addresses  so no actual calculation  numerator denominator  is done  The problem with this is that a divide by zero could occur on the I2C device  so a divide by zero error needs to be checked for  Ideally  exactly the same thing would happen if the dividing were done by the java code   At the moment  I ve bodged an unused variable that does the division  but I m worried it ll get optimized out   public void setKp int numerator  int divisor        int zeroCheck   numerator   divisor            doesn t use zeroCheck     Surely there s a better way

User · Answer

public class ZeroDivisionException extends ArithmeticException                 if  denominator    0        throw new ZeroDivisionException

User · Answer

Something like   if divisor    0      throw new ArithmeticException  Division by zero

User · Answer

There are two ways you could do this   Either create your own custom exception class to represent a divide by zero error or throw the same type of exception the java runtime would throw in this situation   Define custom exception  public class DivideByZeroException   extends ArithmeticException       Then in your code you would check for a divide by zero and throw this exception   if  divisor    0  throw new DivideByZeroException      Throw ArithmeticException  Add to your code the check for a divide by zero and throw an arithmetic exception   if  divisor    0  throw new java lang ArithmeticException    by zero      Additionally  you could consider throwing an illegal argument exception since a divisor of zero is an incorrect argument to pass to your setKp   method   if  divisor    0  throw new java lang IllegalArgumentException  divisor    0

User · Answer

You should not throw an ArithmeticException  Since the error is in the supplied arguments  throw an IllegalArgumentException  As the documentation says      Thrown to indicate that a method has been passed an illegal or inappropriate argument    Which is exactly what is going on here   if  divisor    0        throw new IllegalArgumentException  Argument  divisor  is 0

User · Answer

Do this   if  denominator    0  throw new ArithmeticException  denominator    0      ArithmeticException is the exception which is normally thrown when you divide by 0

[java] How should I throw a divide by zero exception in Java without actually dividing by zero?

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