SCJP 5 : Chapter 2. Flow Control (Part-4)

An Error is a subclass of Throwable that indicates serious problems that a reasonable application should not try to catch. Most such errors are abnormal conditions. The ThreadDeath error, though a "normal" condition, is also a subclass of Error because most applications should not try to catch it.

A method is not required to declare in its throws clause any subclasses of Error that might be thrown during the execution of the method but not caught, since these errors are abnormal conditions that should never occur.

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java.lang.Object 

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            .....java.lang.Throwable 

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            ..........java.lang.Error

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Exception

The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

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java.lang.Object 

            .....

            .....java.lang.Throwable 

            .....

            ..........java.lang.Exception

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RuntimeException

RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.

A method is not required to declare in its throws clause any subclasses of RuntimeException that might be thrown during the execution of the method but not caught.

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java.lang.Object 

            .....

            .....java.lang.Throwable 

            .....

            ..........java.lang.Exception 

            .....

            ...............java.lang.RuntimeException

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Author: Mikalai Zaikin. Please Click Here to visit Authors site for any updates and changes to the study notes.