Add BigDecimal.TWO

Summary

Add the constant java.math.BigDecimal.TWO.

Problem

There is no constant java.math.BigDecimal.TWO which is inconsistent with java.math.BigInteger.TWO.

Solution

Add the constant java.math.BigDecimal.TWO.

Specification

--- a/src/java.base/share/classes/java/math/BigDecimal.java
+++ b/src/java.base/share/classes/java/math/BigDecimal.java
@@ -416,6 +416,14 @@ public class BigDecimal extends Number implements Comparabl
e<BigDecimal> {
     public static final BigDecimal ONE =
         ZERO_THROUGH_TEN[1];

+    /**
+     * The value 2, with a scale of 0.
+     *
+     * @since  19
+     */
+    public static final BigDecimal TWO =
+        ZERO_THROUGH_TEN[2];
+
     /**
      * The value 10, with a scale of 0.
      *