 
JAVA PROGRAMMING
The throw Statement
All Java methods use the throw statement to throw an
exception. The throw statement requires a single argument: a throwable
object. In the Java system, throwable objects are instances of any
subclass of the Throwable class. Here's an example of a throw statement:
throw someThrowableObject;
The throws Clause
You'll notice that the declaration of the pop method
contains this clause:
throws EmptyStackException
The throws clause specifies that the method can throw an
EmptyStackException. As you know, the Java language requires that methods
either catch or specify all checked exceptions that can be thrown within
the scope of that method. You do this with the throws clause of the method
declaration. For more information about this requirement see Java's Catch
or Specify Requirement. Also, Specifying the Exceptions Thrown by a Method
shows you in more detail how a method can specify the exceptions it can
throw.
Here is an example using throw
and throws statement
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