Convert a number to 2 decimal places in Java

Question

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 1

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

Answer 2

DecimalFormat df=new DecimalFormat("0.00"); 

Use this code to get exact two decimal points. Even if the value is 0.0 it will give u 0.00 as output.

Instead if you use:

DecimalFormat df=new DecimalFormat("#.00");   

It wont convert 0.2659 into 0.27. You will get an answer like .27.