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syntactic unit > access unit > variable > variable declared as a non-primitive data type
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variable declared as a non-primitive data type comparison table
Subject refer to declare by have be have scope is a kind of is a subtopic of have syntax rule have purpose destroy in access by have access modifier refer indirectly to has part have access mode use use by contain
variable whose type is an abstract classa class or an object or a primitive datumgiving the data type followed by the name of the variablecomment if it is non-obviousas private as possible variable declared as a non-primitive data typeVariables and Data Types
bold = mandatory
italic = non-terminal
normal font = optional
to refer to an object or a class or a primitive datumthe block where it is declaredother variables and methods in any class in the same package by defaultits value which is an objectvalue the name of a class as its typecalling methods or accessing the object's instance variablesan instance of any subclass of the abstract class

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