Home arrow Java & J2EE arrow Page 2 - Exceptional Class

General Comments - Java

When a method throws an exception, Java requires that it be caught. Some exceptions require action on the programmer’s part and others simply need to be reported to the user. The Java class that we will develop in this article is concerned with the latter type of exception. Instead of rewriting code every time you need to catch an exception, you can create a class to do most of the work for you.

TABLE OF CONTENTS:
  1. Exceptional Class
  2. General Comments
  3. Parsing the String
  4. The Better Way
By: Peter Lavin
Rating: starstarstarstarstar / 19
August 18, 2004

print this article
SEARCH DEV SHED

TOOLS YOU CAN USE

advertisement

The constructor’s first argument (line 21) is an object of the Exception class so this class or any of its subclasses may be passed in. It won’t matter whether you pass in an IOException, an SQLException or any other subtype. The second argument is a Component that will act as the parent window for our dialogue box. Again we have chosen Component because it is the parent object of the various window subclasses.

On line 22 the constructor invokes a method, “doDialogue”, to extract the error message and display it using a JOptionPane. The interesting part of this method is the call to a function to insert a newline character but let’s first look at the output.

Output

Compiling and running the application results in the following output (Image 1):

java.lang.Exception

followed by (Image 2):

java.lang.Exception

This is the same message formatted in two different ways. Now that we’ve seen the output let’s have a look at how it’s done.



 
 
>>> More Java & J2EE Articles          >>> More By Peter Lavin
 

blog comments powered by Disqus
escort Bursa Bursa escort Antalya eskort
   

JAVA & J2EE ARTICLES

- More Java Bugs Lead to More Attacks
- Oracle's Java One Brings News, Surprises
- Oracle Patches Java Runtime Environment
- Apple Syncs Java Update with Oracle
- Spring 3.1 Java Development Framework Compat...
- Jelastic Java PaaS Availability and Pricing ...
- NetBeans 7.1 Released, Supports JavaFX 2
- SolarWinds Releases Newest Version of Java M...
- Free Monitoring Tool for Java Apps on Heroku
- Heroku Adds JCloud Platform Support, Java 7 ...
- Java SE 8 Speculation in Full Swing
- Java SE 7 Now Available
- New JVM Language and Java Reporting Tool
- Java 7 Release Update and New Eclipse Toolkit
- The Best Java Netbeans IDE Plugins

Developer Shed Affiliates

 


Dev Shed Tutorial Topics: