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Welcome to the java lang and java io MCQs Page

Dive deep into the fascinating world of java lang and java io with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of java lang and java io, a crucial aspect of Java Programming. In this section, you will encounter a diverse range of MCQs that cover various aspects of java lang and java io, 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 java lang and java io. 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 java lang and java io. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

java lang and java io MCQs | Page 14 of 26

Q131.
Which of these methods returns the total number of bytes of memory available to the program?
Discuss
Answer: (b).TotalMemory()
Q132.
Which of these Exceptions is thrown by loadClass() method of ClassLoader class?
Discuss
Answer: (d).ClassNotFoundException
Q133.
What is the output of this program?
    class X 
    {
        int a;
        double b;
    }
    class Y extends X 
    {
 int c;
    }
    class Output 
    {
        public static void main(String args[]) 
        {
            X a = new X();
            Y b = new Y();
            Class obj;
            obj = b.getClass();
            System.out.print(obj.getSuperclass());
        }
    }
Discuss
Answer: (c).class X
Q134.
What is the output of this program?
    class X 
    {
        int a;
        double b;
    }
    class Y extends X 
    {
 int c;
    }
    class Output 
    {
        public static void main(String args[]) 
        {
            X a = new X();
            Y b = new Y();
            Class obj;
            obj = b.getClass();
            System.out.print(b.equals(a));
        }
    }
Discuss
Answer: (d).false
Q135.
What is the output of this program?
    class X 
    {
        int a;
        double b;
    }
    class Y extends X 
    {
 int c;
    }
    class Output 
    {
        public static void main(String args[]) 
        {
            X a = new X();
            Y b = new Y();
            Class obj;
            obj = b.getClass();
            System.out.print(obj.isInstance(a));
        }
    }
Discuss
Answer: (d).false
Q136.
Which of these classes encapsulate runtime state of an object?
Discuss
Answer: (a).Class
Q137.
Which of these methods returns the class of an object?
Discuss
Answer: (a).getClass()
Q138.
Which of these methods return a class object given its name?
Discuss
Answer: (d).findSystemClass()
Q139.
Which of these class defines how the classes are loaded?
Discuss
Answer: (d).ClassLoader
Q140.
What is the output of this program?
    class X 
    {
        int a;
        double b;
    }
    class Y extends X 
    {
 int c;
    }
    class Output 
    {
        public static void main(String args[]) 
        {
            X a = new X();
            Y b = new Y();
            Class obj;
            obj = a.getClass();
            System.out.print(obj.getName());
        }
    }

a.

X

b.

Y

c.

a

d.

b

Discuss
Answer: (a).X

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