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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 8 of 12

Q71.
A Class implementing an Interface can use ____access modifier before the implemented methods.
Discuss
Answer: (c).public
Q72.
A Java Class implementing an Interface can define a variable with the same name as that of the Interface constant. State TRUE or FALSE.
Discuss
Answer: (a).TRUE
Q73.
What is the output of the below Java program with an Interface?
interface Worm
{
  int teeth=2;
}
class BookWorm implements Worm
{
  int teeth=4;
  void show()
  {
    teeth= 5;
    System.out.println("Teeth: " + teeth);
  }
}
public class InterfaceTest4
{
  public static void main(String[] args)
  {
    new BookWorm().show();
  }
}
Discuss
Answer: (b).Teeth: 5
Q74.
A Java Interface can not declare constructors. State TRUE or FALSE.
Discuss
Answer: (a).TRUE
Q75.
What is the output of the below Java program with an Interface?
interface Floor
{
  Floor(){ }
}
public class InterfaceTest5
{
  public static void main(String[] args)
  {
    System.out.print("Floor");
  }
}
Discuss
Answer: (c).Compiler error
Q76.
Java 8 (Java 1.8) introduced the ___ feature.
Discuss
Answer: (c).Default and Static methods
Q77.
Java Interface static methods have ___ compatibility with the existing project code.
Discuss
Answer: (c).Both Forward and Backward
Q78.
Java Interface DEFAULT methods have ___ compatibility with the existing project code.
Discuss
Answer: (c).Backward and Forward
Q79.
The DEFAULT methods of an Interface are suitable mostly for ___ type of projects.
Discuss
Answer: (a).Open Source (Public Repositories)
Q80.
Is it possible to remove the keyword DEFAULT and make the method abstract again in an Interface, if the Interfacebelongs to a Closed-Source project?
Discuss
Answer: (a).Yes

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