Throwing Errors 

• In Java terms, errors are thrown to an event handler which catches it and processes it. 
• Thus, exception objects are always instances of the Throwable class and can be thrown from a routine to an error handler. In the following example, we see that the readLine() method might throw an IOException error object if it has trouble reading a line. 


public String readLine() throws IOException

• It is also of interest to know that a method may throw multiple errors by listing them as a comma separated list after the "throws" keyword. 
• Of course, a method may perform correctly without throwing an error. The throws portion just allows the method to deal with the "other" cases. 
• You can also throw your own error objects including both those available through the JDK as well as ones you create yourself. 

Additional Resources:

• Learning to Write Java 
• Introducing Java (TM) - Your First Applet 
• Java FAQs 
• Java Software 
• java.sun.com 
• Sun Microsystems

Error Handling
Table of Contents
Catching Errors