Polish "Avoid resizing of Maps created by CollectionUtils"

See gh-29190

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

@@ -85,8 +85,7 @@ public abstract class CollectionUtils {
 	 * @see #newLinkedHashMap(int)
 	 */
 	public static <K, V> HashMap<K, V> newHashMap(int expectedSize) {
-		int capacity = (int) Math.ceil(expectedSize / (double) DEFAULT_LOAD_FACTOR);
-		return new HashMap<>(capacity, DEFAULT_LOAD_FACTOR);
+		return new HashMap<>(computeMapInitialCapacity(expectedSize), DEFAULT_LOAD_FACTOR);
 	}
 
 	/**
@@ -103,8 +102,11 @@ public abstract class CollectionUtils {
 	 * @see #newHashMap(int)
 	 */
 	public static <K, V> LinkedHashMap<K, V> newLinkedHashMap(int expectedSize) {
-		int capacity = (int) Math.ceil(expectedSize / (double) DEFAULT_LOAD_FACTOR);
-		return new LinkedHashMap<>(capacity, DEFAULT_LOAD_FACTOR);
+		return new LinkedHashMap<>(computeMapInitialCapacity(expectedSize), DEFAULT_LOAD_FACTOR);
+	}
+
+	private static int computeMapInitialCapacity(int expectedSize) {
+		return (int) Math.ceil(expectedSize / (double) DEFAULT_LOAD_FACTOR);
 	}
 
 	/**