sorting a JTable using a data vector

Question

I got stuck with a performance problem while writing my program and I need your help! :)

I'm using a JTable to view test results taken from a vector I made and it has 4 columns in it. When I click on a row the details from a saved txt file of that test are shown in a child window. Also, when I click on the columns header the event sends the vector to a function that sorts it according to the pressed column. Every time a new value needs to be entered the sorting function is called again.

My program works fine with a small number of rows. But, when I enter say, 150 rows, every time I enter a new row the Table flicks (the sort probably takes a lot of time), but I have to keep the vector synchronized with the jable because of the "push to view the result" option.

I would really appreciate some help with this. thanks

Answer 1

You shouldn't have to do any sorting yourself. JTable supports sorting natively, and has the convertRowIndexToModel and convertRowIndexToView methods to go from the view index to the model index and vice-versa.

See http://docs.oracle.com/javase/tutorial/uiswing/components/table.html#sorting .

Answer 2

Use JTable's internal sorter (DefaultRowSorter). Do not re-create the vector which holds the data - use Vector's add() method to add new records. In many years of Java GUI development I haven't seen a single case where I had to keep records in the TableModel sorted. Make sure getColumnClass() returns a proper type, so the default sorter knows how to sort the column, and that is all.