Exception Handling - Java: A Beginner's Guide - page 435

to main( ) . Now you can understand why. An input statement might generate an IOExcep-
tion , and at that time, we weren't able to handle that exception. Thus, such an exception
would be thrown out of main( ) and needed to be specified as such. Now that you know
about exceptions, you can easily handle IOException .
Let's look at an example that handles IOException . It creates a method called prompt(
) , which displays a prompting message and then reads a character from the keyboard. Since
input is being performed, an IOException might occur. However, the prompt( ) method
does not handle IOException itself. Instead, it uses a throws clause, which means that the
calling method must handle it. In this example, the calling method is main( ) , and it deals
with the error.
On a related point, notice that IOException is fully qualified by its package name
java.io . As you will learn in Chapter 10 , Java's I/O system is contained in the java.io pack-
age. Thus, the IOException is also contained there. It would also have been possible to
import java.io and then refer to IOException directly.
Three Recently Added Exception Features