Running Java code from MATLAB

I have a Java class which runs smoothly in eclipse. I would like to run the java code from the MATLAB command line. I have added the .class file to the java static path within MATLAB. I am able to create a java object within MATLAB of the java class I wish to run. I can call upon a method within the class but I can't run the entire code (call upon the constructor of the class).

This is my java code for InterfaceTest.class:

package com.rapplogic.xbee.examples.wpan;

public class InterfaceTest {

    int [] y = fill(1, 2, 3);

    public static int [] fill (int a,int b,int c) {

        int [] r = new int [] {a,b,c};

        return r;
    }
public static void main(String[] args) {

int [] y = fill(1, 2, 3);

System.out.println (y[0]);

System.out.println (y[1]);

System.out.println (y[2]);

} }