Java Reference
In-Depth Information
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.
Self-Test Exercises
3. What output is produced by the following code?
int
waitTime = 46;
try
{
System.out.println("Try block entered.");
if
(waitTime > 30)
throw new
Exception("Over 30.");
else if
(waitTime < 30)
throw new
Exception("Under 30.");
else
System.out.println("No exception.");
System.out.println("Leaving try block.");
}
catch
(Exception thrownObject)
{
System.out.println(thrownObject.getMessage());
}
System.out.println("After catch block");
4. Suppose that in Self-Test Exercise 3 , the line
int
waitTime = 46;
is changed to
int
waitTime = 12;
How would this affect the output?
5. In the code given in Self-Test Exercise 3 , what are the
throw
statements?
6. What happens when a
throw
statement is executed? This is a general question.
Explain what happens in general, not simply what happens in the code in Exercise 1
or some other sample code.
7. In the code given in Self-Test Exercise 3 , what is the
try
block?
(continued)
