Java decimal formatting using String.format?
JavaFormattingDecimalJava Problem Overview
I need to format a decimal value into a string where I always display at lease 2 decimals and at most 4.
So for example
"34.49596" would be "34.4959"
"49.3" would be "49.30"
Can this be done using the String.format command?
Or is there an easier/better way to do this in Java.
Java Solutions
Solution 1 - Java
Yes you can do it with String.format:
String result = String.format("%.2f", 10.0 / 3.0);
// result: "3.33"
result = String.format("%.3f", 2.5);
// result: "2.500"
Solution 2 - Java
You want java.text.DecimalFormat.
DecimalFormat df = new DecimalFormat("0.00##");
String result = df.format(34.4959);
Solution 3 - Java
Here is a small code snippet that does the job:
double a = 34.51234;
NumberFormat df = DecimalFormat.getInstance();
df.setMinimumFractionDigits(2);
df.setMaximumFractionDigits(4);
df.setRoundingMode(RoundingMode.DOWN);
System.out.println(df.format(a));
Solution 4 - Java
java.text.NumberFormat is probably what you want.
Solution 5 - Java
NumberFormat and DecimalFormat are definitely what you want. Also, note the NumberFormat.setRoundingMode() method. You can use it to control how rounding or truncation is applied during formatting.
Solution 6 - Java
You want java.text.DecimalFormat