fixed an array type error

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@615975 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/commons/math/estimation/AbstractEstimator.java

@@ -90,9 +90,7 @@ public abstract class AbstractEstimator implements Estimator {
 
         if (++costEvaluations > maxCostEval) {
             throw new EstimationException("maximal number of evaluations exceeded ({0})",
-                    new String[] {
-                    Integer.toString(maxCostEval)
-            });
+                                          new Object[] { new Integer(maxCostEval) });
         }
 
         cost = 0;