How to Format Indian Rupees (INR) in the Indian Numbering System?

Displaying Currency in Indian Numbering Format

Question:

How can I format the Indian Rupee currency (INR) in the Indian numbering system, where numbers are separated by commas after two digits, except for the last set, which is in thousands?

Answer:

Unfortunately, Java SE's standard DecimalFormat does not support variable-width grouping, making it impossible to format numbers according to the Indian numbering system.

However, ICU4J (International Components for Unicode) provides a NumberFormat class that supports this format:

<code class="java">Format format = com.ibm.icu.text.NumberFormat.getCurrencyInstance(new Locale("en", "in"));
System.out.println(format.format(new BigDecimal("100000000")));</code>

Output:

Rs 10,00,00,000.00

Note that the Android version of java.text.DecimalFormat class is implemented using ICU under the hood and supports the variable-width grouping feature as well.

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