Polish contribution

See gh-23237

spring-beans/src/main/java/org/springframework/beans/PropertyBatchUpdateException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -86,11 +86,11 @@ public class PropertyBatchUpdateException extends BeansException {
 
 	@Override
 	public String getMessage() {
-		StringJoiner sb = new StringJoiner("; ", "Failed properties: ", "");
+		StringJoiner stringJoiner = new StringJoiner("; ", "Failed properties: ", "");
 		for (PropertyAccessException exception : this.propertyAccessExceptions) {
-			sb.add(exception.getMessage());
+			stringJoiner.add(exception.getMessage());
 		}
-		return sb.toString();
+		return stringJoiner.toString();
 	}
 
 	@Override

spring-core/src/main/java/org/springframework/core/ResolvableType.java

@@ -1521,11 +1521,11 @@ public class ResolvableType implements Serializable {
 		public String getTypeName() {
 			String typeName = this.rawType.getTypeName();
 			if (this.typeArguments.length > 0) {
-				StringJoiner result = new StringJoiner(", ", "<", ">");
+				StringJoiner stringJoiner = new StringJoiner(", ", "<", ">");
 				for (Type argument : this.typeArguments) {
-					result.add(argument.getTypeName());
+					stringJoiner.add(argument.getTypeName());
 				}
-				return typeName + result.toString();
+				return typeName + stringJoiner;
 			}
 			return typeName;
 		}

spring-core/src/main/java/org/springframework/util/ClassUtils.java

@@ -657,11 +657,11 @@ public abstract class ClassUtils {
 		if (CollectionUtils.isEmpty(classes)) {
 			return "[]";
 		}
-		StringJoiner sj = new StringJoiner(", ", "[", "]");
+		StringJoiner stringJoiner = new StringJoiner(", ", "[", "]");
 		for (Class<?> clazz : classes) {
-			sj.add(clazz.getName());
+			stringJoiner.add(clazz.getName());
 		}
-		return sj.toString();
+		return stringJoiner.toString();
 	}
 
 	/**

spring-web/src/main/java/org/springframework/web/util/pattern/PathPattern.java

@@ -421,6 +421,7 @@ public class PathPattern implements Comparable<PathPattern> {
 		return this.parser.parse(file2 + (firstExtensionWild ? secondExtension : firstExtension));
 	}
 
+	@Override
 	public boolean equals(@Nullable Object other) {
 		if (!(other instanceof PathPattern)) {
 			return false;
@@ -431,10 +432,12 @@ public class PathPattern implements Comparable<PathPattern> {
 				this.caseSensitive == otherPattern.caseSensitive);
 	}
 
+	@Override
 	public int hashCode() {
 		return (this.patternString.hashCode() + this.separator) * 17 + (this.caseSensitive ? 1 : 0);
 	}
 
+	@Override
 	public String toString() {
 		return this.patternString;
 	}
@@ -466,13 +469,13 @@ public class PathPattern implements Comparable<PathPattern> {
 	}
 
 	String toChainString() {
-		StringJoiner buf = new StringJoiner(" ");
+		StringJoiner stringJoiner = new StringJoiner(" ");
 		PathElement pe = this.head;
 		while (pe != null) {
-			buf.add(pe.toString());
+			stringJoiner.add(pe.toString());
 			pe = pe.next;
 		}
-		return buf.toString();
+		return stringJoiner.toString();
 	}
 
 	/**