2. Programming Assignment: Design 4 classes: MyController to control the executi

Question

2. Programming Assignment: Design 4 classes: MyController to control the execution of the example, EampleFactory (a singleton) to create a Service object, . a Service class interface named IAService, a Service class named AService the implements IAService. Have MyController construct the ExampleFactory as a singleton as in program 1 Have MyController use the ExampleFactory method getService() to create an instance of AService. Have MyController use the method ProvideService() in AService to print "T'm now providing the service for MyController"

Explanation / Answer

Given below is the code for the question.
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IAService.java
--------------
public interface IAService {
public void provideService();
}

AService.java
------------
public class AService implements IAService {

@Override
public void provideService() {
System.out.println("I am now porviding the service for MyController");
}

}

ExampleFactory.java
--------
public class ExampleFactory {
private static ExampleFactory instance = null;

public static ExampleFactory getInstance(){
if(instance == null){
System.out.println("Constructing ExampleFactory");
instance = new ExampleFactory();
}
else {
System.out.println("ExampleFactory already exists");
}
return instance;
}

public IAService getService(){
return new AService();
}
}

MyController.java
--------

public class MyController {
public static void main(String[] args) {
IAService service = ExampleFactory.getInstance().getService();
service.provideService();
}
}

output
------
Constructing ExampleFactory
I am now porviding the service for MyController

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