Java classifies exceptions into a few types: checked exceptions, unchecked exceptions, and errors, which must be handled by the JVM. I’ll have more below about how the Java virtual machine ...

For example, a method that sets a sensor’s value is passed an invalid number and throws a checked exception instead of an instance of the unchecked java.lang.IllegalArgumentException class.

I know we've had many fine threads on exceptions in Java. Hopefully this particular question hasn't been discussed to death. I solved Problem 11 on Project Euler today.