温州微信网站定制,做网站的书籍推荐,上海哪个网站能应聘做家教的,合肥做核酸最新通知职责链模式 职责链模式职责链模式解决什么问题#xff1f;职责链模式实现 职责链模式
使多个对象都有机会处理请求#xff0c;从而避免请求的发送者和接收者之间的耦合关系。将这个对象练成一条链#xff0c;并沿着这条链传递该请求#xff0c;知道有一个对象处理它为止
… 职责链模式 职责链模式职责链模式解决什么问题职责链模式实现 职责链模式
使多个对象都有机会处理请求从而避免请求的发送者和接收者之间的耦合关系。将这个对象练成一条链并沿着这条链传递该请求知道有一个对象处理它为止
职责链模式解决什么问题
如请假请求需要主管、经理、总经理批准
public class Request {private String type;private String content;private int number;public String getType() {return type;}public void setType(String type) {this.type type;}public String getContent() {return content;}public void setContent(String content) {this.content content;}public int getNumber() {return number;}public void setNumber(int number) {this.number number;}
}创建类处理请求
public class Manager {protected String name;public Manager(String name) {this.name name;}public void getResult(Request request) {if (name.equals(主管)) {if (request.getNumber() 2) {System.out.println(name 批准 request.getContent() , request.getType() request.getNumber() 天);} else {System.out.println(name 无权处理);}} else if (name.equals(经理)) {if (request.getNumber() 5) {System.out.println(name 批准 request.getContent() , request.getType() request.getNumber() 天);} else {System.out.println(name 无权处理);}} else if (name.equals(总经理)) {System.out.println(name 批准 request.getContent() , request.getType() request.getNumber() 天);}}
}当提出请求时
Request request new Request();
request.setContent(家里有事);
request.setType(请假);
request.setNumber(10);Manager manager new Manager(主管);
manager.getResult(request);
Manager director new Manager(经理);
director.getResult(request);
Manager generalDirector new Manager(总经理);
generalDirector.getResult(request);problem1分支判断过长problem2当新增新的管理类别时都要更改类
职责链模式实现
创建管理者类
abstract class Manager {protected String name;protected Manager superior;public Manager(String name) {this.name name;}public void setSuperior(Manager superior) {this.superior superior;}public abstract void requestApplications(Request request);
}创建职责链处理请求
class CommonManager extends Manager {public CommonManager(String name) {super(name);}Overridepublic void requestApplications(Request request) {if (request.getNumber() 2) {System.out.println(name 批准 request.getContent() , request.getType() request.getNumber() 天);} else {System.out.println(name 无权处理);if (superior ! null) {superior.requestApplications(request);}}}
}class Direct extends Manager {public Direct(String name) {super(name);}Overridepublic void requestApplications(Request request) {if (request.getNumber() 5) {System.out.println(name 批准 request.getContent() , request.getType() request.getNumber() 天);} else {System.out.println(name 无权处理);if (superior ! null) {superior.requestApplications(request);}}}
}class GeneralDirector extends Manager {public GeneralDirector(String name) {super(name);}Overridepublic void requestApplications(Request request) {System.out.println(name 批准 request.getContent() , request.getType() request.getNumber() 天);}
}传递过程
CommonManager manager new CommonManager(主管);
Direct director new Direct(经理);
GeneralDirector generalDirector new GeneralDirector(总经理);manager.setSuperior(director);
director.setSuperior(generalDirector);Request request new Request();
request.setContent(家里有事);
request.setType(请假);
request.setNumber(10);manager.requestApplications(request);
