How can I format Indian Rupee (INR) currency values in the Indian numbering system?

Formatting Currency in Indian Numbering Format

Question:

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

Answer:

Java's standard DecimalFormat class does not support variable-width grouping, so it cannot format values precisely as required.

Solution:

To correctly format INR values in the Indian numbering system, consider using the ICU4J NumberFormat class. Here's an example:

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

This code will produce the following output:

Rs 10,00,00,000.00

Additional Notes:

• The Android version of java.text.DecimalFormat supports variable-width grouping.
• Note that the ICU4J NumberFormat class extends the java.text.Format class, not the java.text.NumberFormat class.

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