Subtract two variable

问题:

I am designing my reports using Jasper reports, I have an income expense report where I am getting total Income using a variable TOT_INCOME and total Expenses using a second variable, TOT_EXPENSES. I need to Subtract the two variable to get the Net Profit. So I have Created a third Variable TOT_PROFIT. I am trying to get the Difference this way. On the third Variable Variable Expresion, I have:

$V{TOT_INCOME}-$V{TOT_EXPENSE}

as My expression. I am getting a wrong output. For example I have this Output:

TOTAL_INCOME  TOTAL_EXPENSES   PROFIT
215,762.00    16,012.00        1,587,228.00

Which is clearly Wrong as 215,762.00-16,012 = 199,750.00. All my values are doubles. On the Third Variable, my calculation is sum. Please Help where I might be doing a Mistake.

回答1:

Because I want others who might have the same problem to find a solution, I will post what finally worked after tirelessly looking for a solution:

1. Create a new textfield with a class type Double then add the following in your texfield expression:

new Double($V{TOT_EXPENSE}.doubleValue() == 0 ? 0 : ($V{TOT_INCOME}.doubleValue()-$V{TOT_EXPENSE}.doubleValue()))

Done!! This Worked for me.