Lesson: Exceptions

The Java programming language uses exceptions to handle errors and other exceptional events. This lesson describes when and how to use exceptions.

What Is an Exception?

An exception is an event that occurs during the execution of a program that disrupts the normal flow of instructions.

The Catch or Specify Requirement

This section covers how to catch and handle exceptions. The discussion includes the try , catch , and finally blocks, as well as chained exceptions and logging.

How to Throw Exceptions

This section covers the throw statement and the Throwable class and its subclasses.

The try-with-resources Statement

This section describes the try -with-resources statement, which is a try statement that declares one or more resources. A resource is as an object that must be closed after the program is finished with it. The try -with-resources statement ensures that each resource is closed at the end of the statement.

Unchecked Exceptions — The Controversy

This section explains the correct and incorrect use of the unchecked exceptions indicated by subclasses of RuntimeException .

Advantages of Exceptions

The use of exceptions to manage errors has some advantages over traditional error-management techniques. You'll learn more in this section.


Questions and Exercises