DecimalFormat - keep all decimal numbers

Question

I'm using DecimalFormat to format doubles into a String. This String is then integrated into my presentation layer. - Problem: I want to keep ALL decimals. Example: "12345678.123456789" - Question: What format should I use? - Remark: I use a different Locale to support multiple layouts. Format: #.## -> This uses ALL numbers BEFORE the decimal, but ROUNDS the numbers AFTER the decimal. I could use #.######### for the big decimal, but what if the decimal is even longer? I found my small test program useful and want to share it with you. Can you help me to show ALL decimals? ``` package be.softwarelab.numbers; import java.text.DecimalFormat; import java.text.DecimalFormatSymbols; import java.util.Locale; public class DecimalNumbersTest { private static final double NUMBER = 123456789.123456789; public static void main(String[] args) { String format01 = "#."; String format02 = "#.#"; String format03 = "#.##"; String format04 = "#.###"; String format05 = "#.####"; System.out.println("=====…

Accepted Answer

String.format might help you out here - NumberFormat

```
  private static void printfWithLocale(Locale locale, Double d){
    System.out.println("Output locale: " + locale.toString());
    String simpleOutputTeplate = "simpleOutputTeplate: %s";
    String refinedOutputTeplate = "refinedOutputTeplate: %.10f";

System.out.println(String.format(locale, simpleOutputTeplate, d));
    System.out.println(String.format(locale, refinedOutputTeplate, d));

}

public static void main(String[] args) {

Double d = new Double(3.1234567890123456789);

printfWithLocale(Locale.US, d);
    System.out.println("");
    printfWithLocale(Locale.FRANCE, d);
  }
```

Code output:

```
Output locale: en_US
simpleOutputTeplate: 3.1234567890123457
refinedOutputTeplate: 3.1234567890

Output locale: fr_FR
simpleOutputTeplate: 3.1234567890123457
refinedOutputTeplate: 3,1234567890
```

You will notice that the %s (string) does not conform to the Locale, but does format the Double up to 17 decimal points. With String.format you can further refine the way your numbers are formatted in a string.

DecimalFormat - keep all decimal numbers

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