Questions and answers for exam Preparation

MCQs

Total Questions : 25 | Page 2 of 3 pages

Question 11. 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 protected.
Declare the method with the keyword public.
Declare the method with the keyword public and private.
Declare the method with the keyword private.
Do not declare the method with any accessibility modifiers.

Discuss Question

Answer: Option E. -> Do not declare the method with any accessibility modifiers.

Question 12. You have the following code in a file called Test.javaclass Base{ public static void main(String[] args){ System.out.println("Hello"); }}public class Test extends Base{}What will happen if you try to compile and run this?

Runtime error
Compiles and runs with no output.
Compiles and runs printing
It will fail to compile.

Discuss Question

Answer: Option C. -> Compiles and runs printing

Question 13. 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) and (II)
Only (I)
(I), (II) and (III)
Only (III)

Discuss Question

Answer: Option D. -> (I), (II) and (III)

Question 14. Choose the correct statementpublic class Circle{ private double radius; public Circle(double radius){ radius = radius; }}

The program has a compilation error because we cannot assign radius to radius.
The program does not compile because Circle does not have a default constructor.
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 it does not have a main method.

Discuss Question

Answer: Option C. -> The program will compile, but we cannot create an object of Circle with a specified radius. The object will always have radius 0.

Question 15. 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);}}

0
5
Runtime Exception
6
Compile with error

Discuss Question

Answer: Option E. -> Compile with error

Question 16. What is the output for the below code ?public class A{ static{ System.out.println("static"); } { System.out.println("block"); } public A(){ System.out.println("A"); } public static void main(String[] args){ A a = new A(); }}

A block static
static block A
None of these
A
static A

Discuss Question

Answer: Option B. -> static block A

Question 17. Determine Output:class MyClass{ static final int a = 20; static final void call(){ System.out.println("two"); } static{ System.out.println("one"); }}public class Test{ public static void main(String args[]){ System.out.println(MyClass.a); }}

one two 20
one
one two
20
one 20

Discuss Question

Answer: Option E. -> one 20

Question 18. Name the keyword that makes a variable belong to a class, rather than being defined for each instance of the class.

abstract
static
final
native
volatile

Discuss Question

Answer: Option B. -> static

Question 19. 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); }}

Compile with error
Runtime Exception
5
0
None of these

Discuss Question

Answer: Option A. -> Compile with error

Question 20. 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"; }}