[디자인패턴] 커멘드(Command)

작성일: 22년 5월 25일

 

Index

1. 배경

2. Robot 코드

3. Command 코드

4. RobotKit 코드

5. Main 코드

 

 

1. 배경

 - 로봇에게 명령어를 주면 순서대로 수행함

 

 

2. Robot 코드

public class Robot {

    public enum Direction { LEFT, RIGHT }

    public void moveForward (int space){
        System.out.println(space + "칸 이동");
    }

    public void turn (Direction _direction){
        System.out.println((_direction == Direction.LEFT ? "왼쪽" : "오른쪽") + "으로 방향전환");
    }

    public void pickup(){
        System.out.println("앞의 물건 집어들기");
    }
}

 

 

3. Command 코드

abstract class Command {
    protected  Robot robot;

    public void setRobot (Robot _robot) {
        this.robot = _robot;
    }
    public abstract void execute();
}

class MoveForwardCommand extends Command {
    int space;
    public MoveForwardCommand (int _space){
        space = _space;
    }
    public void execute(){
        robot.moveForward(space);
    }
}

class TurnCommand extends Command {
    Robot.Direction direction;
    public TurnCommand (Robot.Direction _direction){
        direction = _direction;
    }
    public void execute(){
        robot.turn(direction);
    }
}

class PickupCommand extends Command {
    public void execute(){
        robot.pickup();
    }
}

 

 

4. RobotKit 코드

public class RobotKit {
    private Robot robot = new Robot();
    private ArrayList<Command> commands = new ArrayList<Command>();

    public void addCommand(Command command){
        commands.add(command);
    }

    public void start() {
        for (Command command : commands){
            command.setRobot(robot);
            command.execute();
        }
    }
}

 

 

5. Main 코드

RobotKit robotKit = new RobotKit();

robotKit.addCommand(new MoveForwardCommand(2));
robotKit.addCommand(new TurnCommand(Robot.Direction.LEFT));
robotKit.addCommand(new MoveForwardCommand(1));
robotKit.addCommand(new TurnCommand(Robot.Direction.RIGHT));
robotKit.addCommand(new PickupCommand());
robotKit.start();

 

Referece:

https://www.youtube.com/watch?v=lJES5TQTTWE&t=564s