知识大全 Java设计模式-----Visitor访问者模式

Posted 2022-07-19 知

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　　源自

　　Chain of Responsibility职责链模式

　　为了避免请求的发送者和接收者之间的耦合关系使多个接受对象都有机会处理请求将这些对象连成一条链并沿着这条链传递该请求直到有一个对象处理它为止

　　例子

　　view plaincopy to clipboardprint? public class Boy

　　private boolean hasCar; // 是否有车 private boolean hasHouse; // 是否有房 private boolean hasResponsibility; // 是否有责任心

　　public Boy()

　　public Boy(boolean hasCar boolean hasHouse boolean hasResponsibility) this hasCar = hasCar; this hasHouse = hasHouse; this hasResponsibility = hasResponsibility;

　　public boolean isHasCar() return hasCar;

　　public void setHasCar(boolean hasCar) this hasCar = hasCar;

　　public boolean isHasHouse() return hasHouse;

　　public void setHasHouse(boolean hasHouse) this hasHouse = hasHouse;

　　public boolean isHasResponsibility() return hasResponsibility;

　　public void setHasResponsibility(boolean hasResponsibility) this hasResponsibility = hasResponsibility;

　　public interface Handler public void handleRequest(Boy boy);

　　public class HouseHandler implements Handler

　　private Handler handler;

　　public HouseHandler(Handler handler)

　　this handler = handler;

　　public Handler getHandler() return handler;

　　public void setHandler(Handler handler) this handler = handler;

　　public void handleRequest(Boy boy) if (boy isHasHouse()) System out println( 没想到吧我还有房子 ); else System out println( 我也没有房 ); handler handleRequest(boy);

　　public class CarHandler implements Handler

　　private Handler handler;

　　public CarHandler(Handler handler) this handler = handler;

　　public Handler getHandler() return handler;

　　public void setHandler(Handler handler) this handler = handler;

　　public void handleRequest(Boy boy) if (boy isHasCar()) System out println( 呵呵我有辆车 ); else System out println( 我没有车 ); handler handleRequest(boy);

　　public class ResponsibilityHandler implements Handler

　　private Handler handler;

　　public ResponsibilityHandler(Handler handler) this handler = handler;

　　public Handler getHandler() return handler;

　　public void setHandler(Handler handler) this handler = handler;

　　public void handleRequest(Boy boy) if (boy isHasResponsibility()) System out println( 我只有一颗带Responsibility的心 ); else System out println( 更没有责任心 ); handler handleRequest(boy);

　　public class Girl

　　public static void main(String[] args)

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