An instance of the class. In Java, the run time environment automatically creates one and only one instance of the class for any application that uses the class. This instance contains the class variables that maintain class state and the class methods that implement class operations. Constructors are also class operations. Contrast with object instance.
A collection of attribute instance values that specifies one example of a class. For example, if the class comprised port information for a router port, you could specify an instance of the class by providing a router board and port number for a particular port. The information you provide to specify a class instance is called the instance identifier. Other related terms are instance string, Relative Distinguished Name (RDN), Index, and Named Object.