 
JAVA PROGRAMMING
All exception types are subclass of the built-in
class Throwable. Thus, throwable is at the top of the exception
class hierarchy. Immediately below Throwable are two
subclasses that partition exception into two distinct branches. One branch
is headed by Exception, called RuntimeException.
Exception of this type are automatically defined for
the programs that you write and include things such as division by zero
and invalid array indexing.
The other branch is topped by Error, which is
defines exceptions that are not expected to be caught under normal
circumstances by your program.
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