Design Patterns - Adapter Pattern

CoffeeMachineInterface.java

public interface CoffeeMachineInterface {

    public void chooseFirstSelection();

    public void chooseSecondSelection();

}

CoffeeTouchscreenAdapter.java

public class CoffeeTouchscreenAdapter implements CoffeeMachineInterface {
    private OldCoffeeMachine mOldVendingMachine;

    public CoffeeTouchscreenAdapter(OldCoffeeMachine oldVendingMachine) {
        mOldVendingMachine = oldVendingMachine;
    }

    @Override
    public void chooseFirstSelection() {
        mOldVendingMachine.selectA();
    }

    @Override
    public void chooseSecondSelection() {
        mOldVendingMachine.selectB();
    }
}

OldCoffeeMachine.java

public class OldCoffeeMachine {

    public void selectA() {
        System.out.println("A selection");
    }

    public void selectB() {
        System.out.println("B selection");
    }

}

In this example, we have a new touchscreen coffee machine and we want to connect it to the old coffee machine, I gonna use Adapter​ ​pattern​​ to connect the ​two​ ​incompatible​ ​interfaces ​by​ ​fitting​ ​between them​ ​and​ ​providing​ ​a​ ​compatible​ ​interface​ ​to​ ​both.