Java 天地·Core Java·Lecture Notes·Unit 10 - Applications, File Handling and Exceptions

您的位置：寻梦网首页＞编程乐园＞Java天地＞Core Java＞Java Lecture Notes

Introduction

Content

Apply

Reflect

Extend

Content Index

Content Page # 37

Java’s exception handling scheme

In Java, methods ‘throw’ and ‘catch’ exceptions. Exceptions are defined as classes. Many of the Java built-in classes can ‘throw’ exceptions. The programmer can add new exceptions if necessary.

To ‘throw’ an exception is to indicate that an exception has occurred. When an exception is thrown, it must usually be ‘caught’ (but see below for more information).

Exceptions are defined as classes. For example, the exception generated by opening a file that does not exist is represented as an object the class FileNotFoundException . If we want to indicate that an attempt has been made to open a non-existent file, then we ‘throw a FileNotFoundException ’. The mechanism for doing this will be described later.

Back to top