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Welcome to the Interfaces and Packages MCQs Page

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

Interfaces and Packages MCQs | Page 4 of 12

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Q31.
Which of these class allows us to get real time data about private and protected member of a class?
Discuss
Answer: (c).ReflectPermission
Q32.
Which of this package is used for invoking a method remotely?
Discuss
Answer: (a).java.rmi
Q33.
What is the output of this program?
    import java.lang.reflect.*;
    class Additional_packages
    {  
         public static void main(String args[])
         {
      try
             {
          Class c = Class.forName("java.awt.Dimension");
   Constructor constructors[] = c.getConstructors();
   for (int i = 0; i < constructors.length; i++)
       System.out.println(constructors[i]);
      }
      catch (Exception e)
             {
                   System.out.print("Exception");
             }
        }
    }
Discuss
Answer: (a).Program prints all the constructors of โ€˜java.awt.Dimensionโ€™ package
Q34.
What is the output of this program?
    import java.lang.reflect.*;
    class Additional_packages
    {  
         public static void main(String args[]) 
         {
      try
             {
          Class c = Class.forName("java.awt.Dimension");
   Field fields[] = c.getFields();
   for (int i = 0; i < fields.length; i++)
       System.out.println(fields[i]);
      }
      catch (Exception e)
             {
                   System.out.print("Exception");
             }
        }
    }
Discuss
Answer: (c).Program prints all the data members of โ€˜java.awt.Dimensionโ€™ package
Q35.
Which of these type parameters is used for a generic class to return and accept any type of object?

a.

K

b.

N

c.

T

d.

V

Discuss
Answer: (c).T
Q36.
Which of these type parameters is used for a generic class to return and accept a number?

a.

K

b.

N

c.

T

d.

V

Discuss
Answer: (b).N
Discuss
Answer: (b).class name { /* โ€ฆ */ }
Discuss
Answer: (c).When designing your own collections class (say, a linked list), generics and parameterized types allow you to achieve type safety with just a single class definition as opposed to defining multiple classes
Q39.
Which of the following reference types cannot be generic?
Discuss
Answer: (a).Anonymous inner class
Q40.
What is the output of this program?
    public class BoxDemo
    {
        public static <U> void addBox(U u, java.util.List<Box<U>> boxes)
        {
           Box<U> box = new Box<>();
           box.set(u);
           boxes.add(box);
        }
        public static <U> void outputBoxes(java.util.List<Box<U>> boxes)
        {
            int counter = 0;
            for (Box<U> box: boxes)
            {
                U boxContents = box.get();
                System.out.println("Box #" + counter + " contains [" + boxContents.toString() + "]");
                counter++;
            }
        }
        public static void main(String[] args)
        {
            java.util.ArrayList<Box<Integer>> listOfIntegerBoxes = new java.util.ArrayList<>();
            BoxDemo.<Integer>addBox(Integer.valueOf(10), listOfIntegerBoxes);
            BoxDemo.outputBoxes(listOfIntegerBoxes);
        }
    }
Discuss
Answer: (d).Box #0 contains [10].

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