20 people are going to answer this question, and you're going to end up with 25 different answers.
I don't think there's a standard convention, and in Java it doesn't matter. You could list them alphabetically, or group related methods together, or list private methods first and then public methods, or group setters first and then getters, or list getters and setters together in pairs, etc.
You should do whatever feels most natural to you, unless your professor or boss has defined another convention.
Edit: to see just how arbitrary it is, take a look at all the similar questions in the "related" bar to the right.