Favor Math.[min|max]() over handcrafted code

In line with the general trend toward favoring core JDK APIs for common
tasks in Spring Framework 5.2, this commit replaces handcrafted
statements with Math.min() and Math.max() were applicable.

spring-jms/src/main/java/org/springframework/jms/listener/DefaultMessageListenerContainer.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.
@@ -383,8 +383,7 @@ public class DefaultMessageListenerContainer extends AbstractPollingMessageListe
 	public void setMaxConcurrentConsumers(int maxConcurrentConsumers) {
 		Assert.isTrue(maxConcurrentConsumers > 0, "'maxConcurrentConsumers' value must be at least 1 (one)");
 		synchronized (this.lifecycleMonitor) {
-			this.maxConcurrentConsumers =
-					(maxConcurrentConsumers > this.concurrentConsumers ? maxConcurrentConsumers : this.concurrentConsumers);
+			this.maxConcurrentConsumers = Math.max(maxConcurrentConsumers, this.concurrentConsumers);
 		}
 	}