I'm currently redeveloping an OBJ & MTL importer for my game engine. At the moment, I'm focusing on increasing how quickly I can parse large OBJ files.

For now, I can parse about 1.2M vertices, uvs and normals in around 4-6 seconds. Which is awesome, considering the file that I'm parsing, couldn't be parsed originally.

Anyways, on with my question; I want to be able to make the following method use a StringTokenizer instead of String array. The reason is because using String.split is slow and I want to parse the file relatively fast.

private OBJIndex parseIndex(String token)
{   
    String[] tokens = token.split("/");
    
    OBJIndex result = new OBJIndex();
    result.setVertexIndex(Integer.parseInt(tokens[0]) - 1);
    
    if(tokens.length > 1)
    {
        if(!tokens[1].isEmpty())
        {
            hasUVs = true;
            result.setUvIndex(Integer.parseInt(tokens[1]) - 1);
        }

        if(tokens.length > 2)
        {
            hasNormals = true;
            result.setNormalIndex(Integer.parseInt(tokens[2]) - 1);
        }
    }
    
    return result;
}

How would I go about doing this?