How to store the value of Expression to a variable?

[jhustinel]

I have a variable $V{Col_Var} 

and I've edited the expression like this : ($F{debit}.intValue()==0 ? -$F{credit}.intValue() : $F{debit}.intValue() )

but when I call the varible in the other expression. It seems that the $V{Col_Var}  variable dont store the value when the expression is already been initialized. 

For example : $V{REPORT_COUNT}.intValue() == 1 ? $P{param1}.intValue()+$V{Col_Var}.intValue():$V{Col_Var}.intValue()  

or even just a simple $V{Col_Var}  to print-out the values after its been initialized.

 

Any ideas on how will i get the value of $V{Col_Var}? Any help is appreciated. Thanks in advance.