Make private static field final, as it is a constant

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@776670 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/commons/collections/CollectionUtils.java

@@ -58,7 +58,7 @@ import org.apache.commons.collections.collection.UnmodifiableCollection;
 public class CollectionUtils {
 
     /** Constant to avoid repeated object creation */
-    private static Integer INTEGER_ONE = new Integer(1);
+    private static final Integer INTEGER_ONE = new Integer(1);
 
     /**
      * An empty unmodifiable collection.