Jack Trowbridge Jack Trowbridge - 11 days ago 5
Java Question

Convert a number to 2 decimal places in Java

I want to convert a number to a 2 decimal places (Always show two decimal places) in runtime. I tried some code but it only does, as shown below

20.03034 >> 20.03
20.3 >> 20.3 ( my code only rounds not converts )


however, I want it to do this:

20.03034 >> 20.03
20.3 >> 20.30 (convert it to two decimal places)


My code below:

angle = a variable
angle_screen = a variable

DecimalFormat df = new DecimalFormat("#.##");
angle = Double.valueOf(df.format(angle));
angle_screen.setText(String.valueOf(angle) + tmp);


Any help on how to do this would be great, thanks.

Answer

try this new DecimalFormat("#.00");

update:

    double angle = 20.3034;

    DecimalFormat df = new DecimalFormat("#.00");
    String angleFormated = df.format(angle);
    System.out.println(angleFormated); //output 20.30

Your code wasn't using the decimalformat correctly

The 0 in the pattern means an obligatory digit, the # means optional digit.

update 2: check bellow answer

If you want 0.2677 formatted as 0.27 you should use new DecimalFormat("0.00"); otherwise it will be .27