Limit the number of decimal digits by specifying the precision : Formatter Field Width « Development « Java Tutorial

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2. Development
3. Formatter Field Width

import java.util.Formatter;

public class Main {
  public static void main(String[] argv) throws Exception {
    Formatter fmt = new Formatter();
    fmt.format("Default precision: %f\n", 10.0 / 3.0);
    fmt.format("Two decimal digits: %.2f\n\n", 10.0 / 3.0);
    System.out.println(fmt);

  }
}