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Random() function in Application Builder

Posted Jan 30, 2020, 10:55 a.m. EST API, Simulation Apps, Parameters, Variables, & Functions Version 5.4 2 Replies

Azat Izmaylov
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Hi everyone. I develop the application for my graduation work in Comsol Multiphysics 5.4 and I have a problem. I need to initialize a random variable in the method, but I get an error "Random cannot be resolved to a type". How can I include the Random() function in my application?

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2 Replies Last Post Jan 30, 2020, 11:11 a.m. EST
Lars Dammann COMSOL Employee

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Posted: 5 years ago Jan 30, 2020, 11:06 a.m. EST

Hi, I think you mean to use java.util.Random, is that right? The Application Builder does not manage imports automatically, so you will have to go to the preferences, in the tab "Methods" and activate the option "view all code". With that, you will find some extra code around each method, which shows that a COMSOL method is actually a Java class. At the top, there are imports for some classes by default. If you add java.util.Random to those imports, your code should work.

Alternatively you can refer to random by its full name "java.util.Random" instead of just "Random" everywhere you use it in the code, which also works.

Best wishes, Lars

Hi, I think you mean to use java.util.Random, is that right? The Application Builder does not manage imports automatically, so you will have to go to the preferences, in the tab "Methods" and activate the option "view all code". With that, you will find some extra code around each method, which shows that a COMSOL method is actually a Java class. At the top, there are imports for some classes by default. If you add java.util.Random to those imports, your code should work. Alternatively you can refer to random by its full name "java.util.Random" instead of just "Random" everywhere you use it in the code, which also works. Best wishes, Lars
Azat Izmaylov
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Posted: 5 years ago Jan 30, 2020, 11:11 a.m. EST

Heh, I found the solution of question :) It needed to click File -> Preferences -> Methods and check the flag in "View all code".

Heh, I found the solution of question :) It needed to click File -> Preferences -> Methods and check the flag in "View all code".

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