Usually, for IDEs that support it, though, they have docs (as Java to Javadoc) integrated, so you can read what they do.
Sure, it means you won't remember it, since you can just go straight to what you're looking for, but still, once you read a method/class' doc, you should know what it does (if the name/arguments weren't already enough of a hint for the puny brain reading the code).
Usually, for IDEs that support it, though, they have docs (as Java to Javadoc) integrated, so you can read what they do.
Sure, it means you won't remember it, since you can just go straight to what you're looking for, but still, once you read a method/class' doc, you should know what it does (if the name/arguments weren't already enough of a hint for the puny brain reading the code).
zealdocs.org/ is a great tool for docs. I think mac is dash docs. kapeli.com/dash