FunGraph

public final class FunGraph {
  private FunGraph(){}

  static String mkStringGraph(int xMin,int xMax,int yMin,int yMax){
    String result="";
    for (int y=yMax;y>= yMin;y--){
      for (int x= xMin;x <= xMax;x++){
        if (x*x<=y && (x+1)*(x+1)>y 
            || x*x<=y && (x-1)*(x-1)>y){
          result+="*";
        }else if(x==0){
          result+="|";          
        }else if(y==0){
          result+="-";          
        }else{
          result+=" ";          
        }
      }
      result += "\n";
    }
    return result;
//Oder
/* String result="";

      for(int i = yMax; i>=yMin; i--) {
        int x2 = (i<0) ? (int) Math.sqrt(-i) : (int) Math.sqrt(i);
        for(int j = xMin; j<=xMax; j++) {
          
          if(x2 == j || x2 == -j) {
            result += "*";
          }else {
            if(j==0) {
              result += "|";
            }else {
              if(i == 0) {
                result += "-";
              }else {
                result += " ";
              }
            }
          }
        }
        result += "\n";

*/

  }
}