use uppercase letters in hexadecimal literals

Author: stephengold

config/checkstyle/checkstyle.xml

@@ -198,6 +198,7 @@
         <module name="CommentsIndentation">
             <property name="tokens" value="SINGLE_LINE_COMMENT, BLOCK_COMMENT_BEGIN"/>
         </module>
+        <module name="HexLiteralCase"/>
         <module name="Indentation">
             <property name="arrayInitIndent" value="4"/>
             <property name="basicOffset" value="4"/>

src/main/java/com/github/stephengold/joltjni/Color.java

@@ -354,7 +354,7 @@ public int getUInt32() {
         int aa = ((int) a) << 24;
         int bb = ((int) b) << 16;
         int gg = ((int) g) << 8;
-        int result = aa & 0xff000000 | bb & 0xff0000 | gg & 0xff00 | r & 0xff;
+        int result = aa & 0xFF000000 | bb & 0xFF0000 | gg & 0xFF00 | r & 0xFF;
 
         return result;
     }

src/main/java/com/github/stephengold/joltjni/HeightFieldShapeConstants.java

@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2024 Stephen Gold
+Copyright (c) 2024-2025 Stephen Gold
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -56,11 +56,11 @@ final public class HeightFieldShapeConstants {
     /**
      * {@code cNoCollisionValue} converted to 16 bits
      */
-    final public static int cNoCollisionValue16 = 0xffff;
+    final public static int cNoCollisionValue16 = 0xFFFF;
     /**
      * maximum height when converted to 16 bits
      */
-    final public static int cMaxHeightValue16 = 0xfffe;
+    final public static int cMaxHeightValue16 = 0xFFFE;
     // *************************************************************************
     // constructors
 

src/main/java/com/github/stephengold/joltjni/Jolt.java

@@ -64,13 +64,13 @@ final public class Jolt {
      * <p>
      * value should match Jolt/Physics/Collision/Shape/SubShapeID.h
      */
-    final public static int cEmptySubShapeId = 0xffffffff;
+    final public static int cEmptySubShapeId = 0xFFFF_FFFF;
     /**
      * invalid body ID
      * <p>
      * value should match Jolt/Physics/Body/BodyID.h
      */
-    final public static int cInvalidBodyId = 0xffffffff;
+    final public static int cInvalidBodyId = 0xFFFF_FFFF;
     /**
      * standard 2nd argument to the {@code JobSystemThreadPool} constructor
      * <p>