import java.awt.*;public class Wagon {	// Constants to represent the direction of the Wagon	private final int LEFT =  0;	private final int RIGHT = 1;	private final int UP =    2;	private final int DOWN =  3;	// The size of the wagon	private final int SIZE = 8;	private int xPos, yPos;	private int direction;	//The speed of the wagon	private final int SPEED = 5;	public Wagon(int x, int y) {		xPos = x;		yPos = y;		direction = UP;	}	//To change the facing direction of the wagon.	public void faceUp(){		direction = UP;	}	public void faceDown(){		direction = DOWN;	}	public void faceLeft(){		direction = LEFT;	}	public void faceRight(){		direction = RIGHT;	}	//To move the wagon	public void move(Rectangle boundary){		if(direction == UP && yPos - SIZE > boundary.y){			yPos -= SPEED;		}else if(direction == DOWN && yPos + SIZE  < boundary.y + boundary.height){			yPos += SPEED;		}else if(direction == LEFT && xPos - SIZE  > boundary.x){			xPos -= SPEED;		}else if(direction == RIGHT && xPos + SIZE  < boundary.x + boundary.width){			xPos += SPEED;		}	}	//Pass the current position of the wagon	public int getX(){		return xPos - SIZE;	}	public int getY(){		return yPos - SIZE;	}	public int getSize(){		return SIZE;	}	// Display the wagon.  The direction the wagon is facing	// is indicated by a narrow rectangle.	public void draw(Graphics g) {		// Draw the main body of the wagon		g.setColor(Color.blue);		g.fillRect(xPos-SIZE, yPos-SIZE, 2*SIZE, 2*SIZE);		g.setColor(Color.black);		g.drawRect(xPos-SIZE, yPos-SIZE, 2*SIZE, 2*SIZE);		// Calculate the position of the direction indicator		Rectangle directionIndicator;		if (direction == UP) {			directionIndicator = new Rectangle(xPos-SIZE+2, yPos-SIZE+2, 2*SIZE-4, 3);		} else if (direction == DOWN) {			directionIndicator = new Rectangle(xPos-SIZE+2, yPos+SIZE-5, 2*SIZE-4, 3);		} else if (direction == LEFT) {			directionIndicator = new Rectangle(xPos-SIZE+2, yPos-SIZE+2, 3, 2*SIZE-4);		} else {			directionIndicator = new Rectangle(xPos+SIZE-5, yPos-SIZE+2, 3, 2*SIZE-4);		}		// Draw the direction indicator		g.setColor(Color.white);		g.fillRect(directionIndicator.x, directionIndicator.y, directionIndicator.width, directionIndicator.height);		g.setColor(Color.black);		g.drawRect(directionIndicator.x, directionIndicator.y, directionIndicator.width, directionIndicator.height);	}}