Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses.

1. In Factory Pattern we have Product(Abstract), ConcreteProduct and Creator(Abstract), ConcreteCreator
2. ConcreteCreator would create ConcreteProduct by implementing abstract factory method of Creator which has Product return type
3. Incase if there is any new Product to be added it fully supports Open Closed Principle(Open For Extension, Closed for Changes).
4. Open for Extension – Adding new ConcreteProduct and ConcreateCreator class, Closed for Changes – No changes in anyother code unlike Simple factory or static factory method which requires change in Switchcase, enum (or) if case
5. Closed for Changes – No changes in anyother code unlike Simple factory or static factory method which requires change in Switchcase, enum (or) if case

JobProfile.java

abstract class JobProfile {
    public abstract String mandatorySkills();

    public Integer defaultWorkHrs(){
        return 8;
    }
}

JavaProfile.java

public class JavaProfile extends JobProfile{
    @Override
    public String mandatorySkills() {
        return "Java, Springboot, Microservices";
    }
}

SQLProfile.java

public class SQLProfile extends JobProfile{
    @Override
    public String mandatorySkills() {
        return "Cosmos, MySQL, MSSQL";
    }
}

JobProfileCreator.java

abstract class JobProfileCreator {
    public JobProfile getJobProfile(){
        JobProfile objJobProfile = createJobProfileFactory();
        return objJobProfile;
    }

    public abstract JobProfile createJobProfileFactory();
}

JavaProfileCreator.java

public class JavaProfileCreator extends JobProfileCreator {
    @Override
    public JobProfile createJobProfileFactory() {
       return new JavaProfile();
    }
}

SQLProfileCreator.java

public class SQLProfileCreator extends JobProfileCreator {
    @Override
    public JobProfile createJobProfileFactory() {
        return new SQLProfile();
    }
}

Consultancy.java

public class Consultancy {
    public static void main(String[] args) {
        getProfileDetails(new JavaProfileCreator());
    }

    public static void getProfileDetails(JobProfileCreator jobProfileCreator){
        JobProfile objJobProfile = jobProfileCreator.getJobProfile();
        System.out.println(objJobProfile.mandatorySkills() + " with "+ objJobProfile.defaultWorkHrs() + "hrs of Work");
    }
}

Output

Java, Springboot, Microservices with 8hrs of Work