Through the API document query math class method, print out approximate circle, as long as given the different radii, the size of the circle changes __java

[Java]   View plain  copy  print? import java.lang.math;          Public class mathdraw      {         /**         *  drawing function, input circle radius, Output circle         */          public static void paint (int r)           {            //assume that the center of the circle is at coordinates (R,R)              int x = 0; //x coordinates start              int y = r * 2;     //y coordinates start             int c = 0 ;  //Middle Space Quantity             INT Z&NBsp;= 2; //per line decrement, the step size is set to 2 to adjust the screen aspect ratio.                  for  (int i  = R * 2; I >= 0; I = I-Z)  {                //gets the x value of the coordinates of the drawing * Point                   x = getx (r, y);                 //First draw the Y-value on the left *                  system.out.print (GetSpace (x)  + "*");                c =   (r-x) *2; //with center of output space                  //then draw the Y-value on the right *          &NBsp;      system.out.println (Getspace (c)  + "*");                //per Y-value decrement                   y-=z;              }         }                /**        *  Get the picture * position, Input circle radius and coordinate y value, output coordinate x value         */          Public static int getx (int r, int y)  {              //to take the long side of the triangle               int h = y - r;              Find the triangle short side length              double l =  Math.sqrt ((R * r)  -  (h * h));             //takes x values, Math.Round () returns the nearest integer               return  (int)  math.round (r-l);         }               /**        *   Draw Space         */         public  static string getspace (int i)  {              String s =  "";