Update:
Java is still sedentary, and I'm a little confused about how to encourage him to move around. Setting him on my bed, the floor, my desk, recliner, or lap, he just sits there. He'll sit there and chirp pitifully, and I really want him to start getting some exercise. I'm not sure how to encourage movement. I've made some alterations to his cage so he would have more room to explore, which he hasn't done yet, but I'm hoping he will with time.
It can't be healthy for him to just sit in one spot day in and day out, yet he does, so I'm looking to change that.