Polishing

spring-web/src/main/java/org/springframework/http/CacheControl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -393,7 +393,7 @@ public class CacheControl {
 	}
 
 	private void appendDirective(StringBuilder builder, String value) {
-		if (builder.length() > 0) {
+		if (!builder.isEmpty()) {
 			builder.append(", ");
 		}
 		builder.append(value);