1. Which of these is the method which is executed first before execution of any other thing takes place in a program?
a) main method
b) finalize method
c) static method
d) private method
Explanation: If a static method is present in the program then it will be executed first, then main will be executed
2. What is the process of defining more than one method in a class differentiated by parameters?
a) Function overriding
b) Function overloading
c) Function doubling
d) None of the mentioned
Explanation: Function overloading is a process of defining more than one method in a class with same name differentiated by function signature i:e return type or parameters type and number. Example – int volume(int length, int width) & int volume(int length , int width , int height) can be used to calculate volume.
3. Which of these can be used to differentiate two or more methods having the same name?
a) Parameters data type
b) Number of parameters
c) Return type of method
d) All of the mentioned
4. Which of these data type can be used for a method having a return statement in it?
a) void
b) int
c) float
d) both int and float
5. Which of these statement is incorrect?
a) Two or more methods with same name can be differentiated on the basis of their parameters data type
b) Two or more method having same name can be differentiated on basis of number of parameters
c) Any already defined method in java library can be defined again in the program with different data type of parameters
d) If a method is returning a value the calling statement must have a variable to store that value
Explanation: Even if a method is returning a value, it is not necessary to store that value.
6. What will be the output of the following Java program?
class box
{
int width;
int height;
int length;
int volume;
void volume(int height, int length, int width)
{
volume = width * height * length;
}
}
class Prameterized_method{
public static void main(String args[])
{
box obj = new box();
obj.height = 1;
obj.length = 5;
obj.width = 5;
obj.volume(3, 2, 1);
System.out.println(obj.volume);
}
}
a) 0
b) 1
c) 6
d) 25
7. What will be the output of the following Java program?
class equality
{
int x;
int y;
boolean isequal()
{
return(x == y);
}
}
class Output
{
public static void main(String args[])
{
equality obj = new equality();
obj.x = 5;
obj.y = 5;
System.out.println(obj.isequal);
}
}
a) false
b) true
c) 0
d) 1
8. What will be the output of the following Java program?
class box
{
int width;
int height;
int length;
int volume;
void volume()
{
volume = width * height * length;
}
void volume(int x)
{
volume = x;
}
}
class Output
{
public static void main(String args[])
{
box obj = new box();
obj.height = 1;
obj.length = 5;
obj.width = 5;
obj.volume(5);
System.out.println(obj.volume);
}
}
a) 0
b) 5
c) 25
d) 26
9. What will be the output of the following Java program?
class Output
{
static void main(String args[])
{
int x , y = 1;
x = 10;
if(x != 10 && x / 0 == 0)
System.out.println(y);
else
System.out.println(++y);
}
}
a) 1
b) 2
c) Runtime Error
d) Compilation Error
Explanation: main() method must be made public. Without main() being public java run time system will not be able to access main() and will not be able to execute the code.
10. What will be the output of the following Java program?
class area
{
int width;
int length;
int height;
area()
{
width = 5;
length = 6;
height = 1;
}
void volume()
{
volume = width * height * length;
}
}
class cons_method
{
public static void main(String args[])
{
area obj = new area();
obj.volume();
System.out.println(obj.volume);
}
}
a) 0
b) 1
c) 25
d) 30