Drop explicit zeroing at instantiation of Atomic* objects

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

@@ -474,7 +474,7 @@ public class ConcurrentReferenceHashMap<K, V> extends AbstractMap<K, V> implemen
 		 * The total number of references contained in this segment. This includes chained
 		 * references and references that have been garbage collected but not purged.
 		 */
-		private final AtomicInteger count = new AtomicInteger(0);
+		private final AtomicInteger count = new AtomicInteger();
 
 		/**
 		 * The threshold when resizing of the references should occur. When {@code count}

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -44,7 +44,7 @@ public class CustomizableThreadCreator implements Serializable {
 	@Nullable
 	private ThreadGroup threadGroup;
 
-	private final AtomicInteger threadCount = new AtomicInteger(0);
+	private final AtomicInteger threadCount = new AtomicInteger();
 
 
 	/**

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

@@ -28,7 +28,7 @@ import java.util.concurrent.atomic.AtomicLong;
  */
 public class SimpleIdGenerator implements IdGenerator {
 
-	private final AtomicLong leastSigBits = new AtomicLong(0);
+	private final AtomicLong leastSigBits = new AtomicLong();
 
 
 	@Override