diff --git a/org.springframework.core/src/main/java/org/springframework/util/StringUtils.java b/org.springframework.core/src/main/java/org/springframework/util/StringUtils.java
index 5122122d5b..c2a05fad38 100644
--- a/org.springframework.core/src/main/java/org/springframework/util/StringUtils.java
+++ b/org.springframework.core/src/main/java/org/springframework/util/StringUtils.java
@@ -1064,12 +1064,12 @@ public abstract class StringUtils {
 	 * @param suffix the String to end each element with
 	 * @return the delimited String
 	 */
-	public static String collectionToDelimitedString(Collection coll, String delim, String prefix, String suffix) {
+	public static String collectionToDelimitedString(Collection<?> coll, String delim, String prefix, String suffix) {
 		if (CollectionUtils.isEmpty(coll)) {
 			return "";
 		}
 		StringBuilder sb = new StringBuilder();
-		Iterator it = coll.iterator();
+		Iterator<?> it = coll.iterator();
 		while (it.hasNext()) {
 			sb.append(prefix).append(it.next()).append(suffix);
 			if (it.hasNext()) {
@@ -1086,7 +1086,7 @@ public abstract class StringUtils {
 	 * @param delim the delimiter to use (probably a ",")
 	 * @return the delimited String
 	 */
-	public static String collectionToDelimitedString(Collection coll, String delim) {
+	public static String collectionToDelimitedString(Collection<?> coll, String delim) {
 		return collectionToDelimitedString(coll, delim, "", "");
 	}
 
@@ -1096,7 +1096,7 @@ public abstract class StringUtils {
 	 * @param coll the Collection to display
 	 * @return the delimited String
 	 */
-	public static String collectionToCommaDelimitedString(Collection coll) {
+	public static String collectionToCommaDelimitedString(Collection<?> coll) {
 		return collectionToDelimitedString(coll, ",");
 	}