TIL Formatting numbers by locale in Java

Added Number Formatting because that bugs a lot people and can be really
useful to know & learn.

Author: Dominik Angerer

java/number-formatting.md

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+# NumberFormatting 
+
+## Assignment
+Format a number for a specific locale. For example, the number 12345.123 should be formatted as `12,345.12` in the USA locale, but `12.345,12` in the German locale.
+
+## Solution
+```java
+DecimalFormat currencyFormatter = (DecimalFormat) NumberFormat.getInstance(Locale.getDefault());
+
+currencyFormatter.setMaximumFractionDigits(2);
+currencyFormatter.setMinimumFractionDigits(2);
+
+System.out.println(currencyFormatter.format(12345.12));
+```
+
+Depending on your default Locale the currencyFormatter will format the number the right way.
+
+##### If you have a locale like `Locale.US` it will output:
+```java
+12,345.12
+```
+
+##### Or if you have a locale like `Locale.GERMANY`:
+```java
+12.345,12
+```
+
+### What about the Locale
+Using `Locale.getDefault()` allows you to get the System default, so it depends on your settings. You can test it for other Locale's by using fixed locale values like: `Locale.GERMAN`or `Locale.US` for USA. You also can find the Local according to the `language`/`country` by using `Locale(String language)` or `Locale(String language, String country)`. More details can be found here: [Documentation for Locale].
+
+### Executable Online Java Example:
+Here is an in-browser example that you can try: [Coding Ground Example]
+Steps to run: compile and execute.
+
+[Coding Ground Example]:http://www.tutorialspoint.com/compile_java_online.php?PID=0Bw_CjBb95KQMbHZ0NWc1OVRONkE
+[Documentation for Locale]:http://docs.oracle.com/javase/7/docs/api/java/util/Locale.html