Compact Number Formatting (java-12)

README.md

@@ -31,6 +31,10 @@ This repository contains Java examples that are designed to track and document t
 * [Java 16](java-16/) (March, 2021)
   * [JEP 395](java-16/src/main/java/com/ibrahimatay/JEP395Records.java): Records
 
+* [Java 12](java-12/) (March, 2019)
+  * API Improvements
+    * [Compact Number Formatting](java-12/src/main/java/com/ibrahimatay/CompactNumberFormatting.java)
+
 * [Java 11](java-11/) (September, 2018)
   * [JEP 181](java-11/src/main/java/com/ibrahimatay/JEP181NestBasedAccessControl.java): Nest-Based Access Control
   * [JEP 318](java-11/src/main/java/com/ibrahimatay/JEP318MemoryPolluter.java): Epsilon: A No-Op Garbage Collector

java-12/src/main/java/com/ibrahimatay/CompactNumberFormatting.java

@@ -0,0 +1,50 @@
+package com.ibrahimatay;
+
+import java.text.CompactNumberFormat;
+import java.text.DecimalFormat;
+import java.text.NumberFormat;
+import java.text.ParseException;
+import java.util.Locale;
+import java.util.*;
+
+public class CompactNumberFormatting {
+
+    // Compact Number Formatting support
+    // https://bugs.openjdk.org/browse/JDK-8188147
+
+    // Compact Number Formatting Comes to JDK 12
+    // https://marxsoftware.blogspot.com/2019/01/jdk12-custom-number-formatting.html
+
+    public static void main(String[] args) throws ParseException {
+        NumberFormat fmt = NumberFormat.getCompactNumberInstance(Locale.US, NumberFormat.Style.LONG);
+
+        System.out.println(fmt.parse("100"));
+        System.out.println(fmt.parse("1 thousand"));
+        System.out.println(fmt.parse("10 thousand"));
+        System.out.println(fmt.parse("100 thousand"));
+
+        /*
+        Result:
+            100
+            1000
+            10000
+            100000
+         */
+        NumberFormat minimumFractionDigits = NumberFormat.getCompactNumberInstance(Locale.US, NumberFormat.Style.SHORT);
+        minimumFractionDigits.setMinimumFractionDigits(3);
+
+        System.out.println(minimumFractionDigits.format(10000));
+        System.out.println(minimumFractionDigits.format(10012));
+        System.out.println(minimumFractionDigits.format(100201));
+        System.out.println(minimumFractionDigits.format(1111111));
+
+        /*
+        Result: 
+            10.000K
+            10.012K
+            100.201K
+            1.111M
+        */
+    }
+}
+