Check if a double is infinite in Java

There are two fields for infinity in the Double class: POSITIVE_INFINITY and NEGATIVE_INFINITY which you can check for.

Note that integer division by zero would throw an ArithmeticException thus your line would have to be 4.0/0, 4/0.0 or 4.0/0.0 since 4 and 0 are integers and thus result in integer math.

You can use Double.isInfinite(double)

Here's double doc

The above code produces

ArithmeticException: / by zero

You can catch this exception in a try/catch block.