capitalize 2 hexadecimal literals

Author: stephengold

config/checkstyle/checkstyle.xml

@@ -182,6 +182,7 @@
         <module name="CommentsIndentation">
             <property name="tokens" value="BLOCK_COMMENT_BEGIN"/>
         </module>
+        <module name="HexLiteralCase"/>
         <module name="Indentation">
             <property name="arrayInitIndent" value="4"/>
             <property name="basicOffset" value="4"/>

src/main/java/maud/MaudUtil.java

@@ -1,5 +1,5 @@
 /*
- Copyright (c) 2017-2024 Stephen Gold
+ Copyright (c) 2017-2025 Stephen Gold
  All rights reserved.
 
  Redistribution and use in source and binary forms, with or without
@@ -1146,7 +1146,7 @@ public static BufferedImage render(
             for (int x = 0; x < width; ++x) {
                 for (int byteI = 0; byteI < bytesPerPixel; ++byteI) {
                     int pixelByte = byteBuffer.get(byteOffset);
-                    pixelBytes[byteI] = 0xff & pixelByte;
+                    pixelBytes[byteI] = 0xFF & pixelByte;
                     ++byteOffset;
                 }
                 Color color = pixelColor(format, pixelBytes);

src/main/java/maud/model/cgm/GeometryItem.java

@@ -1,5 +1,5 @@
 /*
- Copyright (c) 2021-2023, Stephen Gold
+ Copyright (c) 2021-2025 Stephen Gold
  All rights reserved.
 
  Redistribution and use in source and binary forms, with or without
@@ -233,7 +233,7 @@ public String toString() {
      */
     private String describe() {
         String name = geometry.getName();
-        int hash = geometry.getMaterial().hashCode() & 0xffff;
+        int hash = geometry.getMaterial().hashCode() & 0xFFFF;
         String description = String.format("%s (mat=%04x)", name, hash);
 
         assert description != null;