String srcText = str;
String[] cells = srcText.split(" ");
String Q_num=cells[0];
String A_num=cells[1];
...................
String[] cells = srcText.split(" ");
String Q_num=cells[0];
String A_num=cells[1];
...................
StringTokenizer st = null;
int aa=0;
st = new StringTokenizer(str," ");
while (st.hasMoreTokens()) {
cells[aa]=new String(st.nextToken());
aa++;
}