Use Collection#toArray(new T[0]) instead of a presized array as it is faster on modern JVMs.

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

@@ -225,7 +225,7 @@ protected void add(final String str) {
 // NOTE: This is no longer public as CharRange is no longer a public class.
 //       It may be replaced when CharSet moves to Range.
     /*public*/ CharRange[] getCharRanges() {
-        return set.toArray(new CharRange[set.size()]);
+        return set.toArray(new CharRange[0]);
     }
 
     //-----------------------------------------------------------------------

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

@@ -7507,7 +7507,7 @@ private static String[] splitByCharacterType(final String str, final boolean cam
             currentType = type;
         }
         list.add(new String(c, tokenStart, c.length - tokenStart));
-        return list.toArray(new String[list.size()]);
+        return list.toArray(new String[0]);
     }
 
     /**
@@ -7735,7 +7735,7 @@ private static String[] splitByWholeSeparatorWorker(
             }
         }
 
-        return substrings.toArray(new String[substrings.size()]);
+        return substrings.toArray(new String[0]);
     }
 
     // -----------------------------------------------------------------------
@@ -7923,7 +7923,7 @@ private static String[] splitWorker(final String str, final char separatorChar,
         if (match || preserveAllTokens && lastMatch) {
             list.add(str.substring(start, i));
         }
-        return list.toArray(new String[list.size()]);
+        return list.toArray(new String[0]);
     }
 
     /**
@@ -8022,7 +8022,7 @@ private static String[] splitWorker(final String str, final String separatorChar
         if (match || preserveAllTokens && lastMatch) {
             list.add(str.substring(start, i));
         }
-        return list.toArray(new String[list.size()]);
+        return list.toArray(new String[0]);
     }
 
     /**
@@ -8835,7 +8835,7 @@ public static String[] substringsBetween(final String str, final String open, fi
         if (list.isEmpty()) {
             return null;
         }
-        return list.toArray(new String[list.size()]);
+        return list.toArray(new String[0]);
     }
 
     /**

src/main/java/org/apache/commons/lang3/exception/ExceptionUtils.java

@@ -274,7 +274,7 @@ public static String[] getRootCauseStackTrace(final Throwable throwable) {
             }
             frames.addAll(trace);
         }
-        return frames.toArray(new String[frames.size()]);
+        return frames.toArray(new String[0]);
     }
 
     /**
@@ -325,7 +325,7 @@ static String[] getStackFrames(final String stackTrace) {
         while (frames.hasMoreTokens()) {
             list.add(frames.nextToken());
         }
-        return list.toArray(new String[list.size()]);
+        return list.toArray(new String[0]);
     }
 
     /**
@@ -438,7 +438,7 @@ public static List<Throwable> getThrowableList(Throwable throwable) {
      */
     public static Throwable[] getThrowables(final Throwable throwable) {
         final List<Throwable> list = getThrowableList(throwable);
-        return list.toArray(new Throwable[list.size()]);
+        return list.toArray(new Throwable[0]);
     }
 
     /**

src/main/java/org/apache/commons/lang3/reflect/FieldUtils.java

@@ -199,7 +199,7 @@ public static Field getDeclaredField(final Class<?> cls, final String fieldName,
      */
     public static Field[] getAllFields(final Class<?> cls) {
         final List<Field> allFieldsList = getAllFieldsList(cls);
-        return allFieldsList.toArray(new Field[allFieldsList.size()]);
+        return allFieldsList.toArray(new Field[0]);
     }
 
     /**
@@ -237,7 +237,7 @@ public static List<Field> getAllFieldsList(final Class<?> cls) {
      */
     public static Field[] getFieldsWithAnnotation(final Class<?> cls, final Class<? extends Annotation> annotationCls) {
         final List<Field> annotatedFieldsList = getFieldsListWithAnnotation(cls, annotationCls);
-        return annotatedFieldsList.toArray(new Field[annotatedFieldsList.size()]);
+        return annotatedFieldsList.toArray(new Field[0]);
     }
 
     /**

src/main/java/org/apache/commons/lang3/reflect/MethodUtils.java

@@ -878,7 +878,7 @@ public static Method[] getMethodsWithAnnotation(final Class<?> cls, final Class<
                                                     final boolean searchSupers, final boolean ignoreAccess) {
         final List<Method> annotatedMethodsList = getMethodsListWithAnnotation(cls, annotationCls, searchSupers,
                 ignoreAccess);
-        return annotatedMethodsList.toArray(new Method[annotatedMethodsList.size()]);
+        return annotatedMethodsList.toArray(new Method[0]);
     }
 
     /**

src/main/java/org/apache/commons/lang3/reflect/TypeUtils.java

@@ -1149,7 +1149,7 @@ public static Type[] normalizeUpperBounds(final Type[] bounds) {
             }
         }
 
-        return types.toArray(new Type[types.size()]);
+        return types.toArray(new Type[0]);
     }
 
     /**

src/main/java/org/apache/commons/lang3/text/StrTokenizer.java

@@ -604,10 +604,10 @@ private void checkTokenized() {
             if (chars == null) {
                 // still call tokenize as subclass may do some work
                 final List<String> split = tokenize(null, 0, 0);
-                tokens = split.toArray(new String[split.size()]);
+                tokens = split.toArray(new String[0]);
             } else {
                 final List<String> split = tokenize(chars, 0, chars.length);
-                tokens = split.toArray(new String[split.size()]);
+                tokens = split.toArray(new String[0]);
             }
         }
     }

src/main/java/org/apache/commons/lang3/time/DurationFormatUtils.java

@@ -564,7 +564,7 @@ static Token[] lexx(final String format) {
         if (inLiteral) { // i.e. we have not found the end of the literal
             throw new IllegalArgumentException("Unmatched quote in format: " + format);
         }
-        return list.toArray(new Token[list.size()]);
+        return list.toArray(new Token[0]);
     }
 
     //-----------------------------------------------------------------------

src/main/java/org/apache/commons/lang3/time/FastDatePrinter.java

@@ -160,7 +160,7 @@ protected FastDatePrinter(final String pattern, final TimeZone timeZone, final L
      */
     private void init() {
         final List<Rule> rulesList = parsePattern();
-        mRules = rulesList.toArray(new Rule[rulesList.size()]);
+        mRules = rulesList.toArray(new Rule[0]);
 
         int len = 0;
         for (int i=mRules.length; --i >= 0; ) {

src/test/java/org/apache/commons/lang3/concurrent/EventCountCircuitBreakerTest.java

@@ -407,7 +407,7 @@ public void propertyChange(final PropertyChangeEvent evt) {
          */
         public void verify(final Boolean... values) {
             assertArrayEquals(values,
-                    changedValues.toArray(new Boolean[changedValues.size()]));
+                    changedValues.toArray(new Boolean[0]));
         }
     }
 }