public float distanceToOtherCircle(Circle circle){
  return (float)Math.abs(Math.sqrt(Math.pow(circle.center.x - center.x,2) + Math.pow(circle.center.y - center.y,2)));
}

public float distanceToOtherCircle ( Circle circle ) { return ( float ) Math . abs ( Math . sqrt ( Math . pow ( circle . center . x - center . x , 2 ) + Math . pow ( circle . center . y - center . y , 2 ) ) ) ; }
distance between circle center
