Being joy filled also happens when you speak a word for someone that you know comes from the Holy Spirit, because they share with you, that it was something they really needed to hear, that changes them. This happened to me today. It fills you with a joy that is unexplainable. You know God used you to speak His word to another.
Joy filled living is also being able to accept people where they are at in life and not let it get to you. You live like Jesus did and you share what you feel you need to share and just love the person where they are at with no judgement.
To me these are 2 examples of joy filled living.