Question

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Round a double to 2 significant figures after decimal point

I have a problem in which I want to draw a string containing a double or float value up to two decimal value. It is easy to do in using System.out.Printf() but how to so using drawString

like the statement below calculates the number to be deawn on JPanel. but what is actually displayed is a String having values upto 14 decimal places. I need to restrict the display to only 2 decimal places

double size= ((int)((((float) maxSize / (float) (40 * 1.0))*100.0))/100.0);

g.drawString("" + size, 135, 100 + range * i);

Answer 1

 double inputNumber = 1.234567;
 DecimalFormat df = new DecimalFormat("#.##");
 String printValue = df.format(inputNumber));
 g.drawString(printValue);