命令接口本身只暴露excute方法抓于，不關心具體實現
public interface Command {
public void execute();
}
LightOnCommand類實現Command接口尽爆，excute方法執(zhí)行打開燈命令
public class LightOnCommand implements Command {
Light light;
public LightOnCommand (Light light) {
this.light = light;
}
@Override
public void execute() {
light.on();
}
}
SimpleRemoteControl類有一個setCommand方法負責設置命令，buttonWasPreesed方法負責執(zhí)行命令的excute方法螟够，具體excute里面什么內容灾梦，沒人關心
public class SimpleRemoteControl {
Command slot;
public SimpleRemoteControl () {};
public void setCommand (Command command) {
slot = command;
}
public void buttonWasPressed () {
slot.execute();
}
}
測試執(zhí)行效果
public class RemoteControlTest {
public static void main(String[] args) {
SimpleRemoteControl remote = new SimpleRemoteControl();
Light light = new Light();
LightOnCommand lightOn = new LightOnCommand(light);
remote.setCommand(lightOn);
remote.buttonWasPressed();
}
}
