checking if 2 equations is bigger than 0

Asked Nov 25 '15 at 14:05

Active Nov 25 '15 at 14:12

Viewed 30 times

if((quantity1[k].getrestmass() - cold[i].getmass()) > 0 
   && (quantity1[k].getrestvolym() - cold[i].getvolym()) > 0)

I want to compare these arguments so that both these numbers are > 0, but I'm getting a null pointer exception.

Exception in thread "main" java.lang.NullPointerException at Main.main(Main.java:88)

edited Nov 25 '15 at 14:12

Mike G

asked Nov 25 '15 at 14:05

David Fröström

5

How can we know what's wrong with it? Please add any errors you get and an expected output for a certain input. – Manu Nov 25 '15 at 14:06
The IF itself looks fine to me – JDurstberger Nov 25 '15 at 14:07
What is on the line 88? – Phong6698 Nov 25 '15 at 14:09
quantity1[k] or cold[i] or quantity1[k].getrestmass() or cold[i].getmass() or quantity1[k].getrestvolym() or cold[i].getvolym() or something else is null... – Mikey Nov 25 '15 at 14:10

0 Answers0