How to round a double to 2 decimal places

Question

If the value is 300.1234, it should be formatted to 300.12. If it is 300, then it should be 300.00

Answer 1

public static double round(double val, int places) 

{
    if (places < 0) throw new IllegalArgumentException();

    long fact = (long) Math.pow(10, places);
    val = val * fact;
    long tmp = Math.round(val);
    return (double) tmp / fact;
}

Answer 2

double value = 200.3456;
System.out.printf("Value: %.2f", value);

You can use either String.format()

String result = String.format("%.2f", value);

Or you can use DecimalForamat()

DecimalFormat df = new DecimalFormat("####0.00");
System.out.println("Value: " + df.format(value));