SUPER is a system reference available for use within an instantiated class hierarchy that, when executed from a subclass, invokes an instance method implemented in a super class. A common use for this system reference is to invoke a super class method that the subclass overrides. The SUPER system reference provides the only way a super class's implementation of an overridden method can be invoked, and it must be invoked from a method of a subclass. Also, the SUPER system reference can only be used within a subclass to invoke a super class method in the class hierarchy of that subclass. There is no way to directly invoke a super class version of an overridden method from outside of the class hierarchy. For more information on the syntax and use of this system reference, see Construct an object.