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单项选择题

A.They pass messages by modifying each other’s member variables
B.They pass messages by modifying the static member variables of each other’s classes
C.They pass messages by calling each other’s instance member methods
D.They pass messages by calling static member methods of each other’s classes.

多项选择题

A.One object is created
B.Two objects are created
C.Three objects are created
D.One reference variable is created
E.Two reference variables are created
F.Three reference variables are created.

单项选择题

A.is also called a static member
B.is always a variable
C.is never a method
D.belongs to a single instance, not to the class as a whole
E.always represents an operation

单项选择题

A.what classes are instantiated from.
B.an instance of a class.
C.a blueprint for creating concrete realization of abstractions.
D.a reference to an attribute.
E.a variable.

单项选择题

A.an implementation of an abstraction.
B.an attribute defining the property of a particular abstraction.
C.a category of objects.
D.an operation defining the behavior for a particular abstraction.
E.a blueprint for making operations.

多项选择题

A.  void setVar (int a, int b, float c){ x = a; y = b; z = c; }
B. public void setVar(int a, float c, int b) { setVar(a, b, c); }
C. public void setVar(int a, float c, int b) { this(a, b, c); }
D. public void setVar(int a, float b){ x = a; z = b; }
E. public void setVar(int ax, int by, float cz) { x = ax; y = by; z = cz; }

多项选择题

A. Member data have no access modifiers.
B. Member data can be modified directly.
C. The access modifier for methods is protected.
D. The access modifier to member data is private.
E. Methods provide for access and modification of data.

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