Improved caching

src/main/java/io/github/retrooper/packetevents/utils/reflection/ClassUtil.java

@@ -28,16 +28,10 @@ import java.util.HashMap;
 import java.util.Map;
 
 public class ClassUtil {
-    private static final Map<String, String> classSimpleNameCache = new HashMap<>();
+    private static final Map<String, String> CLASS_SIMPLE_NAME_CACHE = new HashMap<>();
 
     public static String getClassSimpleName(Class<?> cls) {
         final String className = cls.getName();
-        final String simpleClassName;
-        if (!classSimpleNameCache.containsKey(className)) {
-            classSimpleNameCache.put(className, simpleClassName = cls.getSimpleName());
-        } else {
-            simpleClassName = classSimpleNameCache.get(className);
-        }
-        return simpleClassName;
+        return CLASS_SIMPLE_NAME_CACHE.computeIfAbsent(className, k -> cls.getSimpleName());
     }
 }