Hands-On Design Patterns with Java

Interface

The Builder interface is provided in the following code and consists of eight methods, one for each roaster component:

public interface Builder {    void buildCoolingTray();    void buildExhaustSystem();    void buildGasBurner();    void buildPlatform();    void buildMotor();    void buildThermocouples();    void buildInnerDrum();    void buildMainBody();    Roaster getRoaster();}

The Builder interface also includes a getRoaster() method that returns a Roaster object.