Can someone help me in answering these java questions pl.

1) What is the method name and signature that is the entry point for running a java program stand-alone?

2) If table A has 10 rows, and table B has 20 rows, what is the maximum # of rows I can get back from a single query against these 2 tables?

3)If you exposed a web service, and a windows based client claims they cannot access it, what is the first easy step they can take?