public class RemoteControl {
 
      Command[] onCommands;
      Command[] offCommands;
      
      // initialize emtpy commands in all slots
      public RemoteControl() {
            onCommands = new Command[7];
            offCommands = new Command[7];
            
            Command noCommand = new NoCommand();
            for(int i=0; i<7; i++) {
                  onCommands[i] = noCommand;
                  offCommands[i] = noCommand;
            }
            
      }
      
      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();
      }
      
      public String toString() {
            // ommited the implement to print the remote control based on the configurations
      }
}

public interface Command {
      public void execute();
}
 
 
public class LightOnCommand implements Command {
      Light light;
      
      public LightOnCommand(Light light) {
            this.light = light;
      }
 
      
      public void onButtonWasPushed(int slot) {
            light.on();
      }
}
 
public class LightOffCommand implements Command {
      Light light;
      
      public LightOffCommand(Light light) {
            this.light = light;
      }
 
      
      public void execute() {
            this.light.off();
      }
}
 
public class StereoOnWithCDCommand implements Command {
      Stereo stereo;
      
      public StereoOnWithCDCommand(Stereo stereo) {
            this.stereo = stereo;
      }
 
      
      public void execute() {
            this.stereo.on();
            this.stereo.setCD();
            this.stereo.setVolume(11);
      }
}

public static void main (String[] args) {
 
      // Create all devices (Receiver) in the proper locations
      Light livingRoomLight = new Light("Living Room");
      Light kitchenLight = new Light("Kitchen");
      CeilingFan ceilingFan = new CeilingFan("Living Room");
      GarageDoor garageDoor = new GarageDoor("");
      Stereo stereo = new Stereo("Living Room");
      
      // Create all Light Commands
      LightOnCommand livingRoomLightOn = new LightOnCommand(livingRoomLight);
      LightOffCommand livingRoomLightOff = new LightOffCommand(livingRoomLight);
      LightOnCommand kitchenLightOn = new LightOnCommand(kitchenLight);
      LightOffCommand kitchenLightOff = new LightOffCommand(kitchenLight);
      
      // Create all On & Off Commands for the ceiling fan
      CeilingFanOnCommand ceilingFanOn = new CeilingFanOnCommand(ceilingFan);
      CeilingFanOffCommand ceilingFanOff = new CeilingFanOffCommand(ceilingFan);
      
      // Create all Up & Down Commands for the garage door
      GarageDoorUpCommand garageDoorUp = new GarageDoorUpCommand(garageDoor);
      GarageDoorDownCommand garageDoorDown = new GarageDoorDownCommand(garageDoor);
      
      // Create all On & Off Commands for the stereo
      StereoOnWithCDCommand stereOnWithCD = new StereoOnWithCDCommand(stereo);
      StereoOffCommand stereOff = new StereoOffCommand(stereo);
      
      // Load all the commands into the remote slots
      RemoteControl remoteControl = new RemoteControl();
      remoteControl.setCommand(0, livingRoomLightOn, livingRoomLightOff);
      remoteControl.setCommand(1, kitchenLightOn, kitchenLightOff);
      remoteControl.setCommand(2, ceilingFanOn, ceilingFanOff);
      remoteControl.setCommand(3, stereoOnWithCD, stereoOff);
      System.out.printlin(remoteControl); // print out the remote control
      
      // press the buttons!
      remoteControl.onButtonWasPushed(0);
      remoteControl.offButtonWasPushed(0);
      remoteControl.onButtonWasPushed(1);
      remoteControl.offButtonWasPushed(1);
      remoteControl.onButtonWasPushed(2);
      remoteControl.offButtonWasPushed(2);
      remoteControl.onButtonWasPushed(3);
      remoteControl.offButtonWasPushed(3);
}