//From my JAVA How-to site (general - > part 1 - > Round a double), this
//snippet :

// JDK1.0.2
public class divers {
  public static void main(String args[]){
    divers d = new divers();
    d.testRound();
  }
  
  public void testRound(){
    double r = place(3.1537, 2);
    System.out.println(r); // output is 3.15
    System.out.println("$" + r); // output is $3.15
  }
  
  public void Round(double val, int dec){
    double  = place(val, dec);
  }
  
  double place(double value, int decimalPlace) {
    double power_of_ten = 1;
    while (decimalPlace-- > 0)
      power_of_ten *= 10.0;
    return Math.round(value * power_of_ten)
      / power_of_ten;
  }
}

//    Real Gagnon     mailto:gagnonr@gespro.com
//        JAVA & Javascript How-to
//http://www.geocities.com/SiliconValley/Vista/1337