设计模式-行为型-命令模式-Command

 

编辑

灯类

public class Light {
    private String name;

    public Light() {

    }

    public Light(String name) {
        this.name = name;
    }

    public void on() {
        System.out.println(this.name + " 开灯了...");
    }

    public void off() {
        System.out.println(this.name + " 关灯了...");
    }
}

开光灯命令接口

public interface Command {
    public void execute();
}

开灯类

public class LightOnCommand implements Command {
    Light light;

    public LightOnCommand(Light light) {
        this.light = light;
    }

    @Override
    public void execute() {
        light.on();
    }
}

关灯类

public class LightOffCommand implements Command {
    Light light;

    public LightOffCommand(Light light) {
        this.light = light;
    }

    @Override
    public void execute() {
        light.off();
    }
}

遥控器类

public class RemoteControl {
    Command[] onCommands = new Command[7];
    Command[] offCommands = new Command[7];

    public void setCommand(int slot, Command onCommand, Command offCommand) {
        onCommands[slot] = onCommand;
        offCommands[slot] = offCommand;
    }

    public void onButtonWasPushed(int slot) {
        onCommands[slot].execute();
    }

    public void offButtonWasPushed(int slot) {
        offCommands[slot].execute();
    }
}

演示类

public class Demo {
    public static void main(String[] args) {
        RemoteControl remoteControl = new RemoteControl();
        Light livingRoomLight = new Light("Living Room");
        Light kitchenLight = new Light("Kitchen");

        Command livingRoomLightOn = new LightOnCommand(livingRoomLight);
        Command livingRoomLightOff = new LightOffCommand(livingRoomLight);

        Command kitchenLightOn = new LightOnCommand(kitchenLight);
        Command kitchenLightOff = new LightOffCommand(kitchenLight);

        remoteControl.setCommand(0, livingRoomLightOn, livingRoomLightOff);
        remoteControl.setCommand(1, kitchenLightOn, kitchenLightOff);

        remoteControl.onButtonWasPushed(0);
        remoteControl.offButtonWasPushed(0);

        remoteControl.onButtonWasPushed(1);
        remoteControl.offButtonWasPushed(1);
    }
}

演示结果

编辑