How to call Java from MATLAB:

(1) Create Java file(s):
    example)

    public class helloworld {
       public static void main(String[] args) {
          System.out.println("Hello, world!");
       }
    }

(2) Compile Java classes and keep them in the same folder/directory.

(3) Set the MATLAB path or current directory to the place where you
    compiled the Java files.

(4) Enter classname.method(inputs) to run method from a class.
    example)

    >> helloworld.main('')
    Hello, world!

(5) see HELP JAVA for more info.