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Welcome to the Classes and Methods MCQs Page

Dive deep into the fascinating world of Classes and Methods with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Classes and Methods, a crucial aspect of Java Programming. In this section, you will encounter a diverse range of MCQs that cover various aspects of Classes and Methods, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Java Programming.

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Check out the MCQs below to embark on an enriching journey through Classes and Methods. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Java Programming.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Classes and Methods. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Classes and Methods MCQs | Page 3 of 30

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Q21.
What is the output of this program?
    class box 
    {
        int width;
        int height;
        int length;
        int volume;
        box() 
        {
            width = 5;
            height = 5;
            length = 6;
        }
        void volume() 
        {
             volume = width*height*length;
        } 
    }    
    class constructor_output 
    {
        public static void main(String args[])
        {
            box obj = new box();
            obj.volume();
            System.out.println(obj.volume);
        }
   }
Discuss
Answer: (b).150
Q22.
What is the output of this program?
class Compsci
{
     Compsci()throws IOException
     {
 
     } 
 
}
class Bits extends Compsci
{
     Bits()
     {
 
     }
     public static void main(String[]args)
     {
 
     }
}
Discuss
Answer: (a).compile time error
Discuss
Answer: (a).Private constructor ensures only one instance of a class exist at any point of time
Q24.
What would be the behaviour if this() and super() used in a method?
Discuss
Answer: (c).compile time error
Discuss
Answer: (c).Constructor can be overloaded
Discuss
Answer: (d).Class.getInstance creates object if class does not have any constructor
Discuss
Answer: (b).It can take any number of parameters
Q28.
Abstract class cannot have a constructor.
Discuss
Answer: (b).False
Discuss
Answer: (b).Protected constructor can only be called using super()
Discuss
Answer: (d).Passing itself to method of the same class

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