单项选择题

An instance member（）

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

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单项选择题

An object is（）

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 method is（）

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.

单项选择题

1. public class X {
2. public object m （） {
3. object o = new float （3.14F）；
4. object [] oa = new object [1]；
5. oa[0]= o；
6. o = null；
7. oa[0] = null；
10. return o；
9. }
10. }
When is the float object created in line 3， eligible for garbage collection？（）

A. Just after line 5.
B. Just after line 6.
C. Just after line 7.
D. Just after line 8（that is， as the method returns）.