格林模拟试题三参考答案(２)

 answer to question 16)

 

2) compile time error

an error occurs when the class severn attempts to call the zero parameter constructor in the class base because the base class has an integer constructor java does not provide the "behind the scenes" zero parameter constructor.

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answer to question 17)

1) static methods do not have access to the implicit variable called this
3) a static may not be overriden to be non-static

the implicit variable this refers to the current instance of a class and thus and by its nature a static method cannot have access to it.

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answer to question 18)

1)

char c='1';
>1);

4)

int i=1;
> operator but not a operator but not a 1);

although you might not know the exact result of the operation -1 >>> 2 a knowledge of the way the bits will be shifted will tell you that the result is not plus 1. (the result is more like 1073741823 ) there is no such java operator as the unsigned left shift. although it is normally used for storing characters rather than numbers the char java primitive is actually an unsigned integer type.

and for information on the size of primitives see

answer to question 26)

2) arrays elements are initialized to default values wherever they are created using the keyword new.