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regard on k&b book

 
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on the self test question 1.. how come the answer is B.
it say that has a relationship always rely on instance variable...i taught it should be it always rely on reference variable?
 
ming ming
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i mean chapter 2 question 1
 
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class A {
}

class B {
A a;
}
 
ming ming
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is that a reference variable or instance variable??
 
wise owen
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4.12.3 Kinds of Variables.
 
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