import java.util.Locale;
import java.util.Formatter;

public class Build {
  public static void main(String args[]) {
   StringBuilder sb = new StringBuilder();
   Formatter formatter = new Formatter(sb, Locale.US);
   formatter.format("PI = %12.10f", Math.PI);
   System.out.println(formatter);
  }
}

Results

C:\day06\e2>java Build
PI = 3.1415926536