DECLARATION AND ACCESS CONTROL QUIZ

Choose the correct statementpublic class Circle{ private double radius; public Circle(double radius){ radius = radius; }}

The program will compile, but we cannot create an object of Circle with a specified radius. The object will always have radius 0.

The program has a compilation error because we cannot assign radius to radius.

The program has a compilation error because it does not have a main method.

The program does not compile because Circle does not have a default constructor.

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The object is created with new keyword

At run-time

Depends on the code

At Compile-time

None of these

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A package is a collection of

Interfaces

Classes and Interfaces

Editing tools

Classes

Editing tools and Interfaces

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What will be the output after compiling and running following program code?public class Test{ static int a; public static void main(String[] args){ System.out.println("one"); call(1); } static void call(int a){ this.a=10; System.out.println("two "+a); }}

one two 1

one two 10

Compile time error.

one two 0

None of these

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

From within protected methods you do not have access to public methods.

This method is only accessible from inside the class itself and from inside all subclasses.

This method is accessible from within the class itself and from within all classes defined in the same package as the class itself.

In a class, you cannot declare methods with a lower visibility than the visibility of the class in which it is defined.

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What is the result of compiling and running the following code?class Base{ private Base(){ System.out.print("Base"); }}public class test extends Base{ public test(){ System.out.print("Derived"); } public static void main(String[] args){ new test(); }}

BaseDerived

Compilation Error

Derived

Exception is thrown at runtime

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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?

Declare the method with the keyword public.

Do not declare the method with any accessibility modifiers.

Declare the method with the keyword private.

Declare the method with the keyword public and private.

Declare the method with the keyword protected.

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What is the result of compiling and running the following code?public class Tester{static int x = 4;public Tester(){System.out.print(this.x); // line 1Tester();}public static void Tester(){ // line 2System.out.print(this.x); // line 3}public static void main(String... args){ // line 4new Tester();}}

Compile error at line 1 (static x must be only accessed inside static methods)

Compile error at line 2 (constructors can't be static)

Compile error at line 4 (invalid argument type for method main )

Compile error at line 3 (static methods can't invoke this)

44

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What will be the output for the below code?public class Test{ static{ int a = 5; } public static void main(String[] args){ System.out.println(a); }}

0

None of these

Runtime Exception

5

Compile with error

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Choose the correct statement. Restriction on static methods are: I. They can only call other static methods.II. They must only access static data.III. They cannot refer this or super in any way.

(II) and (III)

(I), (II) and (III)

(I) and (II)

Only (III)

Only (I)

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