單項(xiàng)選擇題

It is desirable that a certain method within a certain class can only be accessed by classes that are defined within the same package as the class of the method. How can such restrictions be enforced？（）

A.Mark the method with the keyword public.
B.Mark the method with the keyword protected.
C.Mark the method with the keyword private.
D.Mark the method with the keyword package.
E.Do not mark the method with any accessibility modifiers.

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多項(xiàng)選擇題

Which of these are keywords in Java？（）

A.default
B.NULL
C.String
D.throws
E.long

單項(xiàng)選擇題

Which statements， when inserted at the indicated position in the following code， will cause a runtime exception when attempting to run the program？（）
class A {}
class B extends A {}
class C extends A {}
public class Q3ae4 {
public static void main（String args[]） {
A x = new A（）；
B y = new B（）；
C z = new C（）；
// insert statement here
}
}

A.x = y；
B.z = x；
C.y = （B） x；
D.z = （C） y；
E.y = （A） y；

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It is desirable that a certain method within a certain class can only be accessed by classes that are defined within the same package as the class of the method. How can such restrictions be enforced？（）

你可能感興趣的試題

Which of these are keywords in Java？（）

It is desirable that a certain method within a certain class can only be accessed by classes that are defined within the same package as the class of the method. How can such restrictions be enforced？（）

Which of these are keywords in Java？（）