Command，命令模式：将一个请求封装为一个对象，从而使你可以用不同的请求对客户进行参数化，对请求排队和记录请求日志，以及支持可撤销的操作。
package com.cbf4life;
public abstract class Group {
public abstract void find();
public abstract void add();
public abstract void delete();
public abstract void change();
public abstract void plan();
}
package com.cbf4life;
public class RequirementGroup extends Group {
public void find() {
System.out.println("找到需求组...");
}
public void add() {
System.out.println("客户要求增加一项需求...");
}
public void change() {
System.out.println("客户要求修改一项需求...");
}
public void delete() {
System.out.println("客户要求删除一项需求...");
}
public void plan() {
System.out.println("客户要求需求变更计划...");
}
} package com.cbf4life;
public class PageGroup extends Group {
public void find() {
System.out.println("找到美工组...");
}
public void add() {
System.out.println("客户要求增加一个页面...");
}
public void change() {
System.out.println("客户要求修改一个页面...");
}
public void delete() {
System.out.println("客户要求删除一个页面...");
}
public void plan() {
System.out.println("客户要求页面变更计划...");
}
}
package com.cbf4life;
public class CodeGroup extends Group {
public void find() {
System.out.println("找到代码组...");
}public void add() {
System.out.println("客户要求增加一项功能...");
}
public void change() {
System.out.println("客户要求修改一项功能...");
}
public void delete() {
System.out.println("客户要求删除一项功能...");
}public void plan() {
System.out.println("客户要求代码变更计划...");
}
}
package com.cbf4life.command;
import com.cbf4life.receiver.CodeGroup;
import com.cbf4life.receiver.PageGroup;
import com.cbf4life.receiver.RequirementGroup;
public abstract class Command {
protected RequirementGroup rg = new RequirementGroup();
protected PageGroup pg = new PageGroup();
protected CodeGroup cg = new CodeGroup();
public abstract void execute();
}
package com.cbf4life.command;
public class AddRequirementCommand extends Command {
public void execute() {
super.rg.find();
super.rg.add();
super.rg.plan();
}
}
package com.cbf4life.command;
public class DeletePageCommand extends Command {
public void execute() {
super.pg.find();
super.rg.delete();
super.rg.plan();
}
} //接头人，就是Invoker 类的实现：
package com.cbf4life.invoker;
import com.cbf4life.command.Command;
public class Invoker {
private Command command;
public void setCommand(Command command){
this.command = command;
}
public void action(){
this.command.execute();
}
}
package com.cbf4life;
import com.cbf4life.command.AddRequirementCommand;
import com.cbf4life.command.Command;
import com.cbf4life.invoker.Invoker;
public class Client {
public static void main(String[] args) {
Invoker xiaoSan = new Invoker(); //接头人就是小三System.out.println("-------------客户要求增加一项需求-----------------");
Command command = new AddRequirementCommand();//接头人接收到命令
xiaoSan.setCommand(command);
//接头人执行命令
xiaoSan.action();
}
} package com.cbf4life;
import com.cbf4life.command.Command;
import com.cbf4life.command.DeletePageCommand;
import com.cbf4life.invoker.Invoker;
//客户
public class Client {
public static void main(String[] args) {
Invoker xiaoSan = new Invoker();
System.out.println("-------------客户要求删除一个页面-----------------");
//客户给我们下命令来
//Command command = new AddRequirementCommand();
Command command = new DeletePageCommand();
xiaoSan.setCommand(command);
xiaoSan.action();
}
}
