## 1. 是什么是命令行设计模式
## 2. 如何使用命令行设计模式
## 3. 代码怎么实现
public interface Command {
public void execute();
}
public class Light {
public void on(){
System.out.println("light is on");
}
public void off(){
System.out.println("light is off");
}
}
public class LightCommand implements Command{
Light light;
public LightCommand(Light light){
this.light = light;
}
@Override
public void execute() {
light.on();
}
}
public class SimpleRemote {
Command slot;
public SimpleRemote(){}
public void setCommand(Command command){
slot =command;
}
public void buttonWasPressed(){
slot.execute();
}
}
public class RemoteController{
public static void main(String[] args) {
SimpleRemote remote = new SimpleRemote();
Light light = new Light();
LightCommand lightCommand= new LightCommand(light);
remote.setCommand(lightCommand);
remote.buttonWasPressed();
}
}
