MATLAB: How to get a value returned by a Java method in MATLAB

classjavaMATLAB

Hi,
I am trying to get value form a java class method. My Java code is as follows:
public class HelloWorld {
  public static void main( String args[] )
  {
    System.out.println( "Hello World:" );
    if (args.length >0){
      System.out.println( args[0] );
    }
  }
    public int f1 (String args[]){
      if (args.length >0){
        System.out.println( args[0] );
      }
      return 123;
    }
  }
When I try to execute the f1 method, it works as long as I am not attempting to get the value 123 to a MATLAB variable. What am I doing wrong? How do I fix this?
Trial>> o=HelloWorld
o =
HelloWorld@4a8b5227
Trial>> javaMethod('f1',o,'ABC')
ABC
Trial>> o.f1('ABC')
ABC
Trial>> a=javaMethod('f1',o,'ABC')
ABC
One or more output arguments not assigned during call to "javaMethod".
Trial>> a=o.f1('ABC')
ABC
One or more output arguments not assigned during call to "f1".
Trial>>

Best Answer

Never mind. I was iterating development and had the old class in memory. I had executed
clear classes
between tries, but I got my numbers when I executed
clear java
Here, I have the old implementation (returns 123) in memory.
Trial>> o.f1('ABC')
ABC
ans =
     123
Then I change it to return 121
Trial>> clear classes
Trial>> o=HelloWorld
o =
HelloWorld@38d5b107
Trial>> o.f1('ABC')
ABC
ans =
     123
Trial>>
To make this work, I executed `clear java`
Trial>> clear java
Trial>> javaaddpath .
Trial>> o=HelloWorld
o =
HelloWorld@273c947f
Trial>> o.f1('ABC')
ABC
ans =
     121
Trial>>
Voilà!
I expected clear classes to work as after running `clear classes`, 'HelloWorld' ceased to show up in the output of `inmem`
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