Reimplement StringUtils.uncapitalize(String) to use

java.lang.CharSequence.codePoints()

Fix code comment

Author: garydgregory

src/changes/changes.xml

@@ -86,6 +86,7 @@ The <action> type attribute can be add,update,fix,remove.
     <action issue="LANG-1768" type="fix" dev="ggregory" due-to="Wang Hailong, Gary Gregory">MutableLong and friends should provide better parsing exceptions Javadocs.</action>
     <action                   type="fix" dev="ggregory" due-to="Gary Gregory">Reimplement StringUtils.toCodePoints(CharSequence) to use java.lang.CharSequence.codePoints().</action>
     <action                   type="fix" dev="ggregory" due-to="Gary Gregory">Reimplement StringUtils.capitalize(String) to use java.lang.CharSequence.codePoints().</action>
+    <action                   type="fix" dev="ggregory" due-to="Gary Gregory">Reimplement StringUtils.uncapitalize(String) to use java.lang.CharSequence.codePoints().</action>
     <!-- ADD -->
     <action                   type="add" dev="ggregory" due-to="Gary Gregory">Add Strings and refactor StringUtils.</action>
     <action issue="LANG-1747" type="add" dev="ggregory" due-to="Oliver B. Fischer, Gary Gregory">Add StopWatch.run([Failable]Runnable) and get([Failable]Supplier).</action>

src/main/java/org/apache/commons/lang3/StringUtils.java

@@ -8965,23 +8965,15 @@ public static String uncapitalize(final String str) {
         if (strLen == 0) {
             return str;
         }
-
         final int firstCodePoint = str.codePointAt(0);
         final int newCodePoint = Character.toLowerCase(firstCodePoint);
         if (firstCodePoint == newCodePoint) {
-            // already capitalized
+            // already uncapitalized
             return str;
         }
-
-        final int[] newCodePoints = new int[strLen]; // cannot be longer than the char array
-        int outOffset = 0;
-        newCodePoints[outOffset++] = newCodePoint; // copy the first code point
-        for (int inOffset = Character.charCount(firstCodePoint); inOffset < strLen; ) {
-            final int codePoint = str.codePointAt(inOffset);
-            newCodePoints[outOffset++] = codePoint; // copy the remaining ones
-            inOffset += Character.charCount(codePoint);
-         }
-        return new String(newCodePoints, 0, outOffset);
+        final int[] newCodePoints = str.codePoints().toArray();
+        newCodePoints[0] = newCodePoint; // copy the first code point
+        return new String(newCodePoints, 0, newCodePoints.length);
     }
 
     /**