Declaration and Access Control
A method within a class is only accessible by classes that are defined within the same package as the class of the method. Which one of the following is used to enforce such restriction?

Do not declare the method with any accessibility modifiers.
Declare the method with the keyword private.
Declare the method with the keyword public.
Declare the method with the keyword protected.
Declare the method with the keyword public and private.

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Declaration and Access Control
Which statements are most accurate regarding the following classes?class A{ private int i; protected int j;}class B extends A{ private int k; protected int m;}

An object of B contains data fields k, m.
An object of B contains data fields j, k, m.
An object of B contains data fields j, m.
An object of B contains data fields i, j, k, m.

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Declaration and Access Control
Determine output:public class InitDemo{static int i = demo();static{ System.out.print(i); }InitDemo(){System.out.print("hello1");}public static void main(String... args){ System.out.print("Hello2");} static int demo(){ System.out.print("InsideDemo");return 10;}}

Hello2 InsideDemo 10
IllegalArgumentException is thrown at runtime.
InsideDemo 10 Hello2
InsideDemo 10 Hello2 hello1
Compilation error.

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Declaration and Access Control
Suppose a class has public visibility. In this class we define a protected method. Which of the following statements is correct?

This method is accessible from within the class itself and from within all classes defined in the same package as the class itself.
From within protected methods you do not have access to public methods.
In a class, you cannot declare methods with a lower visibility than the visibility of the class in which it is defined.
This method is only accessible from inside the class itself and from inside all subclasses.

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Declaration and Access Control
Determine output:class A{{System.out.print("b1 ");}public A(){System.out.print("b2 ");}}class B extends A{static{System.out.print("r1 ");}public B(){System.out.print("r2 ");}{System.out.print("r3 ");}static{System.out.print("r4 ");}}public class Test extends B{public static void main(String[] args){System.out.print("pre ");new Test();System.out.println("post ");}}

r1 r4 pre b1 b2 post
r1 r4 pre b1 b2 r3 r2 post
r1 r4 pre b1 b2 post r3 r2
pre r1 r4 b1 b2 r2 r3 post
Compilation fail

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