Main.java

public class Main {

    public static void main(String[] args) {

        PrinterController.connectToPrinter(PrinterName.PRINTER_A).turnOn();
        PrinterController.connectToPrinter(PrinterName.PRINTER_B).print();

    }
}

Printer.java

public interface Printer {

    void turnOn();
    void turnOf();
    void print();

}

PrinterA.java

public class PrinterA implements Printer {

    @Override
    public void turnOn() {
        System.out.println("printer a turned on");
    }

    @Override
    public void turnOf() {
      //  TODO: implement me
    }

    @Override
    public void print() {
       //  TODO: implement me
    }
}

PrinterB.java

public class PrinterB implements Printer {


    @Override
    public void turnOn() {
      //  TODO: implement me
    }

    @Override
    public void turnOf() {
      //  TODO: implement me
    }

    @Override
    public void print() {
        System.out.println("Printer A printing");
    }
}

PrinterC.java

public class PrinterC implements Printer {

    @Override
    public void turnOn() {
      //  TODO: implement me
    }

    @Override
    public void turnOf() {
      //  TODO: implement me
    }

    @Override
    public void print() {
      //  TODO: implement me
    }
}

PrinterController.java

public class PrinterController {

    private PrinterController() {
    }

    public static Printer connectToPrinter(PrinterName printerName){
        if(printerName.equals(PrinterName.PRINTER_A)){
            return new PrinterA();
        }
        if(printerName.equals(PrinterName.PRINTER_B)){
            return new PrinterB();
        }
        return new PrinterC();
    }

}

PrinterName.java

public enum PrinterName {

    PRINTER_A,
    PRINTER_B,
    PRINTER_C
}