Stuck at “Exception in thread ”main" java.util.NoSuchElementException

Question

I wrote a program with a separate class but I keep getting the same error right after the user inputs the three sides.

The main code is:

package interac         


        

Answer 1

Try removing the following line:

console.close();

You can't read from console once you've closed it.

You almost certainly shouldn't explicitly close your Scanner: doing so will close System.in. It is not a good practice to close a stream that you haven't opened yourself, since some other code may rely on the stream being open, and throw an exception when it isn't.

Debugging such a problem - where the exception is potentially thrown a long way from the cause - is very tricky.