static int[][] g = {{0,-1},{1,0},{1,0},{1,0},{1,0},{0,-1},{0,-1},{0,-1},{0,-1},{0,-1},{0,-1},{1,0},{0,1},{0,1},{0,1},{0,1},{0,1},{0,1},{0,1},{-1,0},{-1,0},{-1,0},{-1,0},{-1,0}};


public void move(){
	Random rg = new Random();
	int d = rg.nextInt(2);

	if(d == 0){//segue o percurso normal
		setCoordinates(x+g[a][0], y+g[a][1]);
		a++;
	}
	else if(d == 1){//inverte o percurso
		a--;
		setCoordinates(x-g[a][0],y-g[a][1]);
	}
}