Use Java 5 getSimpleName API.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1091086 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/lang3/Pair.java

@@ -91,7 +91,7 @@ public int hashCode() {
      */
     @Override
     public String toString() {
-        StringBuilder builder = new StringBuilder(ClassUtils.getShortClassName(this, null));
+        StringBuilder builder = new StringBuilder(this.getClass().getSimpleName());
         builder.append("(");
         builder.append(getLeftElement());
         builder.append(",");