背景介绍:在中国电源大都是220伏的,而日常生活中手机的充电确是5伏1安(苹果),通过类适配器模拟电源适配器实现手机充电功能
Voltage220V(被适配电源)
public class Voltage220V { public int output220V() { int src = 220; System.out.println("电压 = " + src + "伏"); return src; }}
Voltage5V(目标输出)
public interface Voltage5V { int output5V();}
VoltageAdapter(电源适配器)
public class VoltageAdapter extends Voltage220V implements Voltage5V { @Override public int output5V() { int src = output220V(); int dst = src / 44; System.out.printf("适配器将%d伏====>%d伏\n", src, dst); return dst; }}
Phone(手机充电)
public class Phone { public void charging(Voltage5V v) { int src = v.output5V(); if (src <= 5 && src > 0) { System.out.println("电压 = " + src + "伏,可以充电..."); } else if (src > 5) { System.out.println("电压过高"); } else { System.out.println("没有充电..."); } }}
Client
public class Client { public static void main(String[] args) { System.out.println("====类适配器模式===="); Phone phone = new Phone(); phone.charging(new VoltageAdapter()); }}
实现结果:
类适配器模式注意事项和细节
优点:
UML类图:
其他代码与上一致,修改电源适配器即可:
public class VoltageAdapter implements Voltage5V { private Voltage220V voltage220V = null; public VoltageAdapter(Voltage220V voltage220V) { this.voltage220V = voltage220V; } @Override public int output5V() { int src = 0; if (voltage220V != null) { src = voltage220V.output220V(); } int dst = src / 44; System.out.printf("适配器将%d伏====>%d伏\n",src,dst); return dst; }}
Client(测试)
public class Client { public static void main(String[] args) { System.out.println("====对象适配器模式===="); Phone phone = new Phone(); phone.charging(new VoltageAdapter(new Voltage220V())); System.out.println("--------------------"); phone.charging(new VoltageAdapter(null)); }}
实现结果:
简介:
UML类图
背景介绍:模拟springMVC源码展示接口设计模式
接口适配器和实现类
///定义一个Adapter接口 public interface HandlerAdapter { public boolean support(Controller handler); public void handle(Controller handler);}// 多种适配器类class SimpleHandlerAdapter implements HandlerAdapter { public void handle(Controller handler) { handler.doHandler(); } public boolean support(Controller handler) { return (handler instanceof SimpleController); }}class HttpHandlerAdapter implements HandlerAdapter { public void handle(Controller handler) { handler.doHandler(); } public boolean support(Controller handler) { return (handler instanceof HttpController); } }class AnnotationHandlerAdapter implements HandlerAdapter { public void handle(Controller handler) { handler.doHandler(); } public boolean support(Controller handler) { return (handler instanceof AnnotationController); }}
模拟Controller
//多种Controller实现 public interface Controller { void doHandler();}class HttpController implements Controller { @Override public void doHandler() { System.out.println("http..."); }}class SimpleController implements Controller { @Override public void doHandler() { System.out.println("simple..."); }}class AnnotationController implements Controller { @Override public void doHandler() { System.out.println("annotation..."); }}
模拟DispatchServlet
public class DispatchServlet { public static List<HandlerAdapter> handlerAdapters = new ArrayList<HandlerAdapter>(); public DispatchServlet() { handlerAdapters.add(new AnnotationHandlerAdapter()); handlerAdapters.add(new HttpHandlerAdapter()); handlerAdapters.add(new SimpleHandlerAdapter()); } public void doDispatch(Controller controller) { // 得到对应适配器 HandlerAdapter adapter = getHandler(controller); // 通过适配器执行对应的controller对应方法 if (adapter != null) { adapter.handle(controller); } else { System.out.println("没有该适配器..."); } } public HandlerAdapter getHandler(Controller controller) { //遍历:根据得到的controller(handler), 返回对应适配器 for (HandlerAdapter adapter : this.handlerAdapters) { if (adapter.support(controller)) { return adapter; } } return null; } public static void main(String[] args) { new DispatchServlet().doDispatch(new SimpleController() ); new DispatchServlet().doDispatch(new HttpController() ); new DispatchServlet().doDispatch(new AnnotationController()); } }
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