DECLARATION AND ACCESS CONTROL QUIZ

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 3 (static methods can't invoke this)

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

44

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

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

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What will be the output?public class Test{static{int a = 5;}public static void main(String args[]){new Test().call();}void call(){this.a++;System.out.print(this.a);}}

Compile with error

0

5

Runtime Exception

6

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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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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

Exception is thrown at runtime

Derived

Compilation 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.

(I), (II) and (III)

Only (III)

Only (I)

(II) and (III)

(I) and (II)

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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.

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.

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

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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

InsideDemo 10 Hello2

IllegalArgumentException is thrown at runtime.

InsideDemo 10 Hello2 hello1

Compilation error.

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What will be the output?public class Test{ public static void main(String[] args){ String value = "abc"; changeValue(value); System.out.println(value); } public static void changeValue(String a){ a = "xyz"; }}

None of these

Compilation clean but no output

Compilation fails

abc

xyz

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What will be the output after the following program is compiled and executed?public class Test{ public static void main(String args[]){ int x = 10; x = myMethod(x--); System.out.print(x); } static int myMethod(final int x){ return x--; }}

The will compile successfully and display 9 as output.

The program will compile successfully and display 10 as output.

The program will lead to compilation error.

None of these

The program will lead to runtime error.

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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.

Declare the method with the keyword private.

Do not declare the method with any accessibility modifiers.

Declare the method with the keyword public and private.

Declare the method with the keyword protected.

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