Simple calculations

[dewie]

Hi,

 

I'm using ireport to generate some reports for a new project i'm doing.

I build a jetty jruby interface so i can use these reports in ruby on rails.

I would like to do some calculations in ireport ( i now use a xml datasource and do the calculations in ruby on rails)

 

The problem is i can't do a simple calculation like the following :

 

F{field_price} * $F{quantity}

 

I get all sort of java errors, i tried google for a basic instruction in calculating in java , but no joy.

 

Can someone put me in a right way by some examples of calculating in ireport, or to a java tutorial i can use ?

 

Kind regards daniel

[megotronx]

hi dewie!

 

try this:

 

new java.lang.Integer( ($F{field_price}.intValue()) *($F{quantity}.intValue()) )

[dewie]

What if i need doubles ? quantity is not always a integer , for example 12.45

[megotronx]

then try this:

 

new java.lang.Double( ($F{field_price}.doubleValue()) *($F{quantity}.doubleValue()) )

[dewie]

Thanks ! that does the trick, any good link where i can find this sort of java information ?

[svenn]

The best link is the Java API. This is the one for 5 but you can also find ones for earler versions.

 

http://java.sun.com/j2se/1.5.0/docs/api/