Well this one works…
double roundOff = Math.round(a * 100.0) / 100.0;
Output is
123.14
Or as @Rufein said
double roundOff = (double) Math.round(a * 100) / 100;
this will do it for you as well.
double d = 2.34568;
DecimalFormat f = new DecimalFormat(“##.00”);
System.out.println(f.format(d));