how to do variable + 1 in iReport

i want to do line no in different band ar开发者_开发技巧ea. example, in group band i want it to appear

1. 2. and the next band area, such as detail band, i want it continue 3. 4.

i dont it reset. how???

Create a group_COUNT variable. Make it an Integer, give it Calculation type Count, Reset type Report, Increment type Group and select the Increment Group. The Variable Expression should be $V{group_COUNT}++. Drop it to your Group zone and it should increment each time the group changes.

If you have created a group and you are using the detail band (means in detail band you have to print the valueis as you said ) then use the report generated variable like (your groupname_count) which gives the valuu like 123 and next band 3,4 as query found the records in the detail band. or if you have created the group and you have to print the nor as 1, 2 like this and for next group records 3,4 then create one variable class name is maths big decimal, calculation count, reset type your group nameincrement type none,variable expersion(in which the field which have alws value display) place there initial value expression is 0.