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Exception class has two constructors, one of which allows a message to be included in each instance.
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The user can either throw an exception of type Exception with a unique message, or create own subclass of Exception:
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public static void MyMethod() throws MyException
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{ . . .
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throw new MyException;
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. . . }
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class MyException extends Exception
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{ public MyException ()
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{ super ("This is my exception message."); }
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}
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Methods which call "MyMethod" should use a try and catch block which catches an exception e of type MyException. Methods e.getMessage and e.printStackTrace can be used on Exceptions.
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