Add fill method for boolean arrays in ArrayFill utility class

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

@@ -44,6 +44,21 @@ public static byte[] fill(final byte[] a, final byte val) {
         return a;
     }
 
+    /**
+     * Fills and returns the given array, assigning the given {@code boolean} value to each element of the array.
+     *
+     * @param a   the array to be filled (may be null).
+     * @param val the value to be stored in all elements of the array.
+     * @return the given array.
+     * @see Arrays#fill(boolean[],boolean)
+     */
+    public static boolean[] fill(final boolean[] a, final boolean val) {
+        if (a != null) {
+            Arrays.fill(a, val);
+        }
+        return a;
+    }
+
     /**
      * Fills and returns the given array, assigning the given {@code char} value to each element of the array.
      *

src/test/java/org/apache/commons/lang3/ArrayFillTest.java

@@ -49,6 +49,25 @@ public void testFillByteArrayNull() {
         assertSame(array, actual);
     }
 
+    @Test
+    public void testFillBooleanArray() {
+        final boolean[] array = new boolean[3];
+        final boolean val = true;
+        final boolean[] actual = ArrayFill.fill(array, val);
+        assertSame(array, actual);
+        for (final boolean v : actual) {
+            assertEquals(val, v);
+        }
+    }
+
+    @Test
+    public void testFillBooleanArrayNull() {
+        final boolean[] array = null;
+        final boolean val = true;
+        final boolean[] actual = ArrayFill.fill(array, val);
+        assertSame(array, actual);
+    }
+
     @Test
     public void testFillCharArray() {
         final char[] array = new char[3];