matlab java interface--can not add the user-defined class to the Java class path

I coded a simple class: test and compiled it and put it in the 'D:\Dropbox\projects\ICPR2013\code\java\union_find'.

    public class test {
        public test() {
            System.out.printf("hello world!");
        }
    }

And then I use the following code to bring the defined class to the Java class path. I also use javaclasspath to make sure that the folder including 'test' class is added to the Java class path.

    javaaddpath('D:\Dropbox\projects\ICPR2013\code\java\union_find');

But when I use x = javaObjectEDT('test'); to call the 'test' class, it gives me the following error: No class test can be located on Java class path

[Geoff Hayes]

zhang - have you verified that the test.class file is in the D:\Dropbox\projects\ICPR2013\code\java\union_find folder? I used your code for the test class and was able to create an instance of it. I added the folder to the java path using a similar call to javaaddpath and then just observed

 >>  x = javaObjectEDT('test'); 
 hello world!>> x

 x =
     test@13265564