Polish

Author: ngocnhan-tran1996

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

@@ -139,11 +139,11 @@ public Collection<V> values() {
 		Collection<V> values = this.values;
 		if (values == null) {
 			Collection<List<V>> targetValues = this.targetMap.values();
-			values = new AbstractCollection<V>() {
+			values = new AbstractCollection<>() {
 				@Override
 				public Iterator<V> iterator() {
 					Iterator<List<V>> targetIterator = targetValues.iterator();
-					return new Iterator<V>() {
+					return new Iterator<>() {
 						@Override
 						public boolean hasNext() {
 							return targetIterator.hasNext();

spring-test/src/main/java/org/springframework/test/web/servlet/result/PrintingResultHandler.java

@@ -207,7 +207,7 @@ protected void printResolvedException(@Nullable Exception resolvedException) thr
 	protected void printModelAndView(@Nullable ModelAndView mav) throws Exception {
 		this.printer.printValue("View name", (mav != null) ? mav.getViewName() : null);
 		this.printer.printValue("View", (mav != null) ? mav.getView() : null);
-		if (mav == null || mav.getModel().size() == 0) {
+		if (mav == null || mav.getModel().isEmpty()) {
 			this.printer.printValue("Model", null);
 		}
 		else {