Create an interface called . The interface has an absract …

Create an interface called . The interface has an absract method called that displays a message describing the meaning of “play” to the class. Create classes called , and that all implement . Create an application that demonstrates the use of the classes. Save the files as

Answer

The development and implementation of interfaces in object-oriented programming (OOP) is essential for achieving code reusability and maintainability. In this assignment, we are tasked with creating an interface called “PlayInterface” and implementing it in three different classes, “ClassA”, “ClassB”, and “ClassC”. The application should demonstrate the use of these classes.

To start, we will define the “PlayInterface” interface. An interface is a collection of abstract methods that define a contract for classes to adhere to. In this case, the interface will have one abstract method called “displayMeaningOfPlay()” which will be responsible for displaying a message describing the meaning of “play” to the class.

The code snippet for the “PlayInterface” interface would look like this:

“`
public interface PlayInterface {
void displayMeaningOfPlay();
}
“`

Now, we will move on to the implementation of the classes: “ClassA”, “ClassB”, and “ClassC”. These classes will implement the “PlayInterface” interface, and each will provide its own implementation for the “displayMeaningOfPlay()” method.

The code snippet for the “ClassA” implementation would look like this:

“`
public class ClassA implements PlayInterface {
@Override
public void displayMeaningOfPlay() {
System.out.println(“ClassA: play means engaging in recreational activities for enjoyment.”);
}
}
“`

The code snippet for the “ClassB” implementation would look like this:

“`
public class ClassB implements PlayInterface {
@Override
public void displayMeaningOfPlay() {
System.out.println(“ClassB: play means participating in competitive sports or games.”);
}
}
“`

The code snippet for the “ClassC” implementation would look like this:

“`
public class ClassC implements PlayInterface {
@Override
public void displayMeaningOfPlay() {
System.out.println(“ClassC: play means exploring and experimenting in creative activities.”);
}
}
“`

Now that we have defined and implemented the classes, we can move on to creating an application to demonstrate the use of these classes. In this case, let’s create a simple application that creates objects of each class, invokes the “displayMeaningOfPlay()” method on each object, and displays the output.

The code snippet for the application would look like this:

“`
public class PlayApp {
public static void main(String[] args) {
PlayInterface classA = new ClassA();
PlayInterface classB = new ClassB();
PlayInterface classC = new ClassC();

classA.displayMeaningOfPlay();
classB.displayMeaningOfPlay();
classC.displayMeaningOfPlay();
}
}
“`

In the application, we create objects of each class and store them in variables of the “PlayInterface” type. This allows us to access the common behavior defined in the interface. We then invoke the “displayMeaningOfPlay()” method on each object, which will call the appropriate implementation provided by each class.

When we run the application, we should see the following output:

“`
ClassA: play means engaging in recreational activities for enjoyment.
ClassB: play means participating in competitive sports or games.
ClassC: play means exploring and experimenting in creative activities.
“`

This demonstrates the use of interfaces and their implementations in a Java application. By using interfaces, we can define common behavior and ensure that classes provide their own unique implementations for that behavior. This promotes code reusability and flexibility in design.