public class Adapter extends Adaptee implements ExpectedInterface {    public void doWork() {        actualDoWork();    }}

public class Adapter implements ExpectedInterface {    private Adaptee adaptee;    public void doWork() {        adaptee.actualDoWork();    }}

public interface ExpectedInterface {    public void doWork();}

public class Adaptee {    public void actualDoWork() {        // do work    }}

expectedInterface.doWork();