Snake

	public class Snake {

		private int snakeLength;
		private Position[] snakeBody;

		public Snake(int row, int col) {
			snakeLength = 1;
			snakeBody = new Position[5];
			Position initial = new Position(row, col);
			snakeBody[0] = initial;
		}

	public int getLength() {
		return snakeLength;
	}

	public Position getPosition(int index) {
		if(index < 0 || index >= snakeLength) {
			return null;
		}
		return snakeBody[index];
	}

	public void shrink() {
		snakeLength = snakeLength - 1;
	}

	public boolean snakePosition(Position pos) {
		for(int i = 0; i < snakeLength;i++) {
			if (snakeBody[i].equals(pos)) {
				return true;
			}
		}
		return false;
	}

	public Position newHeadPosition(String direction) {
		Position pos = snakeBody[0];
		int currentCol = pos.getCol();
		int currentRow = pos.getRow();
		if(direction == "up") {
			pos = new Position(currentRow-1,currentCol);
		}
		if(direction == "down") {
			pos = new Position(currentRow+1,currentCol);
		}
		if(direction == "left") {
			pos = new Position(currentRow,currentCol-1);
		}
		if(direction == "right") {
			pos = new Position(currentRow,currentCol+1);
		}
		return pos;
	}

	public void moveSnake(String direction) {
		Position originHead = snakeBody[0];
		Position newHead = newHeadPosition(direction);
		snakeBody[0] = newHead;
		for(int i = 1; i <= snakeLength - 1; i++) {
			Position origin = originHead;
			originHead = snakeBody[i];
			snakeBody[i] = origin;
		}
	}



	public void grow(String direction) {

		if (snakeLength == snakeBody.length) {
			increaseArraySize();
		}

		snakeLength = snakeLength + 1;
		Position originHead = snakeBody[0];
		snakeBody[0] = newHeadPosition(direction);
		for(int i = 1; i < snakeLength; i++) {
			Position origin = originHead;
			originHead = snakeBody[i];
			snakeBody[i] = origin;
		}

	}

	private void increaseArraySize() {
		Position[] newArray = new Position[snakeLength*2];
		for (int i = 0; i < snakeBody.length; i++) {
			   newArray[i] = snakeBody[i];
			}
		snakeBody = newArray;
	}

	public static void main (String[] args) {
		Snake theSnake = new Snake(2,1);
		theSnake.snakePosition(new Position(0,1));

	}
}