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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 1 of 30

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Q1.
What is the stored in the object obj in following lines of code?

box obj;
Discuss
Answer: (b).NULL
Q2.
Which of these keywords is used to make a class?
Discuss
Answer: (a).class
Q3.
Which of the following is a valid declaration of an object of class Box?
Discuss
Answer: (a).Box obj = new Box();
Q4.
Which of these operators is used to allocate memory for an object?
Discuss
Answer: (c).new
Discuss
Answer: (a).Every class must contain a main() method
Q6.
What is the output of this program?
    class main_class 
    {
        public static void main(String args[])
        {
            int x = 9;
            if (x == 9) 
            { 
                int x = 8;
                System.out.println(x);
            }
        } 
    }
Discuss
Answer: (c).Compilation error
Discuss
Answer: (a).Public method is accessible to all other classes in the hierarchy
Q8.
What is the output of this program?
    class box 
    {
        int width;
        int height;
        int length;
    } 
    class mainclass 
    {
        public static void main(String args[]) 
        {        
             box obj = new box();
             obj.width = 10;
             obj.height = 2;
             obj.length = 10;
             int y = obj.width * obj.height * obj.length; 
             System.out.print(y);
        } 
    }
Discuss
Answer: (b).200
Q9.
What is the output of this program?
    class box 
    {
        int width;
        int height;
        int length;
    } 
    class mainclass 
    {
        public static void main(String args[]) 
        {        
            box obj1 = new box();
            box obj2 = new box();
            obj1.height = 1;
            obj1.length = 2;
            obj1.width = 1;
            obj2 = obj1;
            System.out.println(obj2.height);
        } 
    }
Discuss
Answer: (a).1
Q10.
What is the output of this program?
   class box 
   {
        int width;
        int height;
        int length;
   } 
    class mainclass 
    {
        public static void main(String args[]) 
        {        
            box obj = new box();
            System.out.println(obj);
        } 
    }
Discuss
Answer: (d).classname@hashcode in hexadecimal form

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