Exception Handling - Java - page 479

catch ( Exception_Class_Name Catch_Block_Parameter )
{
< Code to be performed if an exception of the named exception
class is thrown in the try block. >
}

You may use any legal identifier for the Catch_Block_Parameter ; a common choice is e . The
code in the catch block may refer to the Catch_Block_Parameter . If there is an explicit
throw statement, it is usually embedded in an if statement or an if-else statement.
There may be any number of throw statements and/or any number of method invocations
that may throw exceptions. Each catch block can list only one exception, but there can be
more than one catch block.
EXAMPLE
See Display 9.2.

Exception Classes from Standard Packages
Numerous predefined exception classes are included in the standard packages that come
with Java. The names of predefined exceptions are designed to be self-explanatory.
Some sample predefined exceptions are

IOException
NoSuchMethodException
FileNotFoundException

The predefined exception class Exception is the root class for all exceptions. Every
exception class is a descendent of the class Exception (that is, it is derived directly
from the class Exception or from a class that is derived from the class Exception , or it
arises from some longer chain of derivations ultimately starting with the class
Exception ). You can use the class Exception itself, just as we did in Display 9.2, but
you are even more likely to use it to define a derived class of the class Exception . The
class Exception is in the java.lang package and so requires no import statement.

Exception

The Class Exception
Every exception class is a descendent class of the class Exception . You can use the class
Exception itself in a class or program, but you are even more likely to use it to define a
derived class of the class Exception . The class Exception is in the java.lang package and
so requires no import statement.