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variable declared as a non-primitive data type
subject			fact

variable declared as a non-primitive data type	contains an instance of a class
	is a subtopic of The Basics of Java
	is used by calling methods or accessing the object's instance variables
	is a kind of variable
	uses the name of a class as their type
variable	can refer to a particular object, several different objects during the execution of a program, or no object at all
	has scope
	has type
	should have comment if it is non-obvious