责任链(ChainofResponsibility)模式

接下来是四个ConcreteHandler—— & & &blic class AdviceEmailHandler implements Handler {

private Handler nextHandler; private BusinessDepartment businessDepartment;

public AdviceEmailHandler() { businessDepartment = new BusinessDepartment(); }

@Override public void nextHandler(Handler nextHandler) { ndler = nextHandler; }

@Override public void handleEmail(Email email) { if (email != null) { if (e() == _EMAIL) { ail(email); }

else Email(email); } }}以及其辅助类 blic class BusinessDepartment { public void readEmail(Email email) { n("Business department read the email : " +

tent()); }}

public class ComplainEmailHandler implements Handler {

private Handler nextHandler; private LawDepartment lawDepartment;

public ComplainEmailHandler() { lawDepartment = new LawDepartment(); }

@Override public void nextHandler(Handler nextHandler) { ndler = nextHandler; }

@Override public void handleEmail(Email email) { if (email != null) { if (e() == IN_EMAIL) { ail(email); } else Email(email); } }}以及其辅助类 blic class LawDepartment {

public void readEmail(Email email) { n("Law department read the Email :" +

tent()); }}