LANG-1695: Allow trailing decimal point in NumberUtils.isParsable (#1531)

* LANG-1695: Allow trailing decimal point in NumberUtils.isParsable

* Remove extra blank line

---------

Co-authored-by: Gary Gregory <[email protected]>

Author: harshitt-goel

src/main/java/org/apache/commons/lang3/math/NumberUtils.java

@@ -724,7 +724,7 @@ public static boolean isNumber(final String str) {
      * @since 3.4
      */
     public static boolean isParsable(final String str) {
-        if (StringUtils.isEmpty(str) || str.charAt(str.length() - 1) == '.') {
+        if (StringUtils.isEmpty(str)) {
             return false;
         }
         if (str.charAt(0) == '-') {

src/test/java/org/apache/commons/lang3/math/NumberUtilsTest.java

@@ -1013,7 +1013,7 @@ void testIsParsable() {
         assertFalse(NumberUtils.isParsable("pendro"));
         assertFalse(NumberUtils.isParsable("64, 2"));
         assertFalse(NumberUtils.isParsable("64.2.2"));
-        assertFalse(NumberUtils.isParsable("64."));
+        assertTrue(NumberUtils.isParsable("64."));
         assertFalse(NumberUtils.isParsable("64L"));
         assertFalse(NumberUtils.isParsable("-"));
         assertFalse(NumberUtils.isParsable("--2"));
@@ -1025,6 +1025,7 @@ void testIsParsable() {
         assertTrue(NumberUtils.isParsable("-018"));
         assertTrue(NumberUtils.isParsable("-018.2"));
         assertTrue(NumberUtils.isParsable("-.236"));
+        assertTrue(NumberUtils.isParsable("2."));
     }
 
     /**