Adaptor pattern : Example 2

To reuse classes and make new class compatible with existing ones.

For example, A clean system is already designed, you want to add more job in, the Extra interface uses adapter pattern to plug in the existing system.

interface Clean {

    public void makeClean();

}

class Office implements Clean {

    public void makeClean() {

        System.out.println("Clean Office");

    }

}

class Workshop implements Clean {

    public void makeClean() {

        System.out.println("Clean Workshop");

    }

}

interface Extra extends Clean {

    public void takeCare();

}

class Facility implements Extra {

    public void makeClean() {

        System.out.println("Clean Facility");

    }

    public void takeCare() {

        System.out.println("Care has been taken");

    }

}

In order to reuse Workshop and Office classes, we create an adapter interface Extra and add new job takeCare in the system.

class Test {

   static void Jobs (Extra job) {

       if (job instanceof Clean)

           ((Clean)job).makeClean();

       if (job instanceof Extra)

           ((Extra)job).takeCare();

   }

   public static void main(String[] args) {

       Extra e = new Facility();

       Jobs(e);

       Clean c1 = new Office();

       Clean c2 = new Workshop();

       c1.makeClean();

       c2.makeClean();

       e.makeClean();

   }

}