Thanks for your help rosenkranz.

Is it beacuse the picture shows free space, so the array should be 25 and the free space count as " " or ""? The detail shows that just 24 card returned in an array, Am I wrong? Since, I can't debug the test code, because there is no parameter passing, so the test code in server side decides the result and we don't know about the test code in server side.

same for me too, why we got this error, even if the return array is wright, and I have tried it in netbeans too and it's work.