Result Set - How to retrieve the number of rows in resultset

harlo....everyone.
i m new in this language and would like to ask that how can i store the result into an array or u all hav others ideal to do it......? Hopefully can get answer asap....thanksssss.
Below is the source code that i did. Please comment it
ResultSet rs = stmt.executeQuery("Select CCourse_Code from RegisteredCourse, Student where Student.NStud_ID ='123'and Student.CStud_Pwd='123' and Student.NStud_ID = RegisteredCourse.NStud_ID ");
if(rs!=null){
// can i get the the number of records in resultset, rs to define my array size
String course[] = new String[2];
while(rs.next()){
for(int i =0; i<course.length; i++)
course[i] = rs.getString("ccourse_code");
return course;

Or...
ResultSet rs = stmt.executeQuery("Select count(CCourse_Code) from RegisteredCourse, Student where Student.NStud_ID ='123'and Student.CStud_Pwd='123' and Student.NStud_ID = RegisteredCourse.NStud_ID ");
This should return a table with one row and one column. This will hold the number originally requested.
However I would still go with the ArrayList suggestion given above.

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