need udf based on the delimiter "."

Hi Experts,

               i need a UDF for splitting of a string based on the delimiter "." i have done with the following udf but it is not working with my delimiter. it is working with the ";" delimiter.

for (int i = 0; i < field1.length; i++)

{

          String tokens[] = field1[i].split(".");

         field1_out.addValue(tokens[0]);

         field2_out.addValue(tokens[1]);

         field3_out.addValue(tokens[2]);

sample input --Action.20150302.0101 so here i need to split it in to 3 strings so that i will do some validations on the timestamp.

please help me guys

Thanks

Giridhar