private static String join(List<String> list, String glue) {
        StringBuilder sb = new StringBuilder();
        for(int i = 0; i < list.size(); ++i) {
            if(sb.length() != 0)
                sb.append(glue);
            sb.append(list.get(i));
        }
        return sb.toString();
    }
FBX file format loader
<p> Loads scene meshes, materials, textures, skeleton and skeletal animation.
Multiple animations can be defined with {@link AnimationList} passing into {@link SceneKey}
or loaded from different animation layer.</p>
jme3-plugins/src/fbx/java/com/jme3/scene/plugins/fbx/SceneLoader.java