The Exception Hierarchy

The Exception Hierarchy:


In Java, all exceptions are represented by classes. All exception classes are derived from a class called Throwable. Thus, when an exception occurs in a program, an object of some type of exception class is generated. There are two direct subclasses of Throwable: Exception and Error. Exceptions of type Error are related to errors that occur in the Java virtual machine itself, and not in your program. These types of exceptions are beyond your control, and your program will not usually deal with them. 

 

Errors that result from program activity are represented by subclasses of Exception. For example, divide-by-zero, array boundary, and file errors fall into this category. In general, your program should handle exceptions of these types. An important subclass of Exception is RuntimeException, which is used to represent various common types of run-time errors.

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