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

Discuss Question

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

Question 12. Choose the correct statement
public class Circle{
private double radius;
public Circle(double radius){
radius = radius;
}
}

The program has a compilation error because it does not have a main method.
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 does not compile because Circle does not have a default constructor.

Discuss Question

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

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.

Only (I)
(I) and (II)
(II) and (III)
Only (III)
(I), (II) and (III)

Discuss Question

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

Question 14. You have the following code in a file called Test.java
class 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?

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

Discuss Question

Answer: Option D. -> Compiles and runs printing

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);
}
}

Compile with error
Runtime Exception
5
6
0

Discuss Question

Answer: Option A. -> Compile with error

Question 16. 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
one two
one two 20
20
one 20

Discuss Question

Answer: Option E. -> one 20

Question 17. 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
static A
A
None of these

Discuss Question

Answer: Option B. -> static block A

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

static
final
abstract
native
volatile

Discuss Question

Answer: Option A. -> static

Question 19. 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";
}
}

abc
xyz
Compilation fails
Compilation clean but no output
None of these

Discuss Question

Answer: Option A. -> abc

Question 20. 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);
}
}