Question

I have two arraylists named fw_week and sw_week…
Now have to calculate fw_diff which is difference between fw_week and sw_week
and sw_diff which is difference between sw_week and fw_week…

I have used like following script,

    fw_diff=fw_week;
    sw_diff=sw_week;
    fw_diff.removeAll(sw_week);
    sw_diff.removeAll(fw_week);

In this, am getting the fw_diff correctly but the fw_week value is also changed which now equal to fw_diff, so the second value sw_diff is giving the wrong value, but i don’t want to change the fw_week and sw_week values… So please can anyone help me to solve this issue….

Answer 1

fw_diff= fw_week.clone().removeAll(sw_week)
sw_diff=sw_week.clone().removeAll(fw_week)

More efficient one:

fw_diff= fw_week.clone().removeAll(sw_week)
sw_diff=sw_week.clone().removeAll(fw_diff)

Here,fw_diff contains intersaction of both the list. So now , for sw_diff , we need to remove only fw_diff from sw_week . No need to remove all of fw_week .