基于JAVA的设计模式之命令模式

• 介绍

　　　　让行为的发送者和执行者完全解耦，当用户发出命令后，无需关注谁来执行命令，有转发者来进行命令的调配和转发。

　　　　 -Receiver:命令的执行action者

　　　　 -Command:命令标准接口

　　　 　-ConcreteCommand:具体的命令

　　　 　-Invoker:包含Command，命令的传递者

• 类图

　　

• 代码

public interface Kitchener {
    public void cook();
}

public class BeefKitchener implements Kitchener {
    public void cook() {
        System.out.println("做牛肉");
    }
}

public class ChickenKitchener implements Kitchener {
    public void cook() {
        System.out.println("做烤鸡");
    }
}

public interface Command {
    public void execute();
}

public class CookBeefCommand implements Command {
    private Kitchener kitchener;
    public void execute() {
        kitchener=new BeefKitchener();
        kitchener.cook();
    }
}

public class CookChickenCommand implements Command {
    private Kitchener kitchener;
    public void execute() {
        kitchener=new ChickenKitchener();
        kitchener.cook();
    }
}

public class WaiterInvoker {
    private Command command;

    public void setCommand(Command command) {
        this.command = command;
    }

    public void action(){
        command.execute();
    }
}

public class Main {
    public static void main(String[] args) {
        WaiterInvoker waiterInvoker=new WaiterInvoker();
        Command command=new CookBeefCommand();
        waiterInvoker.setCommand(command);
        waiterInvoker.action();
    }
}