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Baldwin discusses and illustrates many of the details having to do with exception handling in Java.

Revised: Fri Apr 01 18:00:56 CDT 2016

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Table of contents

Preface

This module is one of a series of modules designed to teach you about Object-Oriented Programming (OOP) using Java.

Viewing tip

I recommend that you open another copy of this document in a separate browser window and use the following links to easily find and view the Figuresand Listings while you are reading about them.

Figures

  • Figure 1 . Throwable constructors.
  • Figure 2 . Methods of the Throwable class.
  • Figure 3 . Compiler error from an unhandled checked exception.
  • Figure 4 . Another compiler error.
  • Figure 5 . Output from program that throws ArithmeticException.
  • Figure 6 . Syntax of a try block.
  • Figure 7 . Syntax of a catch block.
  • Figure 8 . Output produced by the finally block.
  • Figure 9 . Syntax for declaring that a method throws exceptions.
  • Figure 10 . Example of a throw statement.
  • Figure 11 . Output from the for loop.
  • Figure 12 . Output from the exception handler.
  • Figure 13 . Output from code following the catch block.

Listings

  • Listing 1 . Sample program with no exception handling code.
  • Listing 2 . Sample program that fixes one compiler error.
  • Listing 3 . Sample program that fixes the remaining compiler error.
  • Listing 4 . A sample program that throws an exception.
  • Listing 5 . The power of the finally block.
  • Listing 6 . The class named MyException.
  • Listing 7 . The try block.
  • Listing 8 . A matching catch block.
  • Listing 9 . Code following the catch block.
  • Listing 10 . Complete program listing for Excep16.

Preview

This module explains Exception Handling in Java. The discussion includes the following topics:

  • What is an exception?
  • How do you throw and catch exceptions?
  • What do you do with an exception once you have caught it?
  • How do you make use of the exception class hierarchy provided by the Java development environment?

This module will cover many of the details having to do with exception handling in Java. By the end of the module, you should know that the use ofexception handling is not optional in Java, and you should have a pretty good idea how to use exception handling in a beneficial way.

Discussion and sample code

Introduction

Stated simply, the exception-handling capability of Java makes it possible for you to:

  • Monitor for exceptional conditions within your program
  • Transfer control to special exception-handling code (which you design) if an exceptional condition occurs

The basic concept

This is accomplished using the keywords: try , catch , throw , throws , and finally . The basic concept is as follows:

  • You try to execute the statements contained within a block of code. (A block of code is a group of one or more statements surrounded by curly brackets.)
  • If you detect an exceptional condition within that block, you throw an exception object of a specific type.
  • You catch and process the exception object using code that you have designed.
  • You optionally execute a block of code, designated by finally , which needs to be executed whether or not an exception occurs. (Code in the finally block is normally used to perform some type of cleanup.)

Questions & Answers

Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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