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while((line=br.readLine())!=null){
ArrayList<String> list=new ArrayList<String>();
StringTokenizer st = new StringTokenizer(line, ",");
while(st.hasMoreTokens()){
list.add(st.nextToken());
}
v.add(list);
num=list.size();
}
class MyTable extends AbstractTableModel{
public int getColumnCount(){
return num;
}
...
}