| << Chapter < Page | Chapter >> Page > |
| Figure 12 . Output from the exception handler. |
|---|
In exception handler, get the message
3 |
When the catch block finishes execution ...
When the code in the catch block has completed execution, control is transferred to the first executable statement following the catch block as shown in Listing 9 .
| Listing 9 . Code following the catch block. |
|---|
System.out.println(
"Out of catch block");}//end main
}//end class Excep16 |
That executable statement is a print statement that produces the output shown in Figure 13 .
| Figure 13 . Output from code following the catch block. |
|---|
Out of catch block |
Complete program listing
A complete listing of the program named Excep16 is shown in Listing 10 .
| Listing 10 . Complete program listing for Excep16 . |
|---|
/*File Excep16.java
Copyright 2002, R. G. BaldwinIllustrates defining, throwing,
catching, and processing a customexception object that contains a
message.Tested using JDK 1.4.0 under Win 2000
The output is:Processing data for cnt = 0
Processing data for cnt = 1Processing data for cnt = 2
In exception handler, get the message3
Out of catch block**************************************/
//The following class is used to// construct a customized exception
// object containing a messageclass MyException extends Exception{
MyException(String message){//constrsuper(message);
}//end constructor}//end MyException class
//===================================//class Excep16{//controlling class
public static void main(String[] args){try{
for(int cnt = 0; cnt<5; cnt++){
//Throw a custom exception, and// pass message when cnt == 3
if(cnt == 3) thrownew MyException("3");
//Transfer control before// processing for cnt == 3
System.out.println("Processing data for cnt = "
+ cnt);}//end for-loop
}//end try blockcatch(MyException e){
System.out.println("In exception handler, "
+ "get the message\n"+ e.getMessage());
}//end catch block//-------------------------------//
System.out.println("Out of catch block");
}//end main |
This module has covered many of the details having to do with exception handling in Java. By now, you should know that the use of exception handling isnot optional in Java, and you should have a pretty good idea how to use exception handling in a beneficial way.
Along the way, the discussion has included the following topics:
That concludes the "Essence of OOP" portion of the ITSE 2321 sub-collection. The series is continued in the ITSE 2317 sub-collection.
This section contains a variety of miscellaneous information.
Financial : Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware that some of the HTML elements in this module may not translate well into PDF.
I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version of the module.
In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. Ineither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please beaware that it is a copy of a module that is freely available on cnx.org and that it was made and published withoutmy prior knowledge.
Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.
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