How do I get a value returned by a Java method in MATLAB?

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>>

Answer 1

[Bharath Lohray]

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`