Why do variable names often start with the letter 'm'? [duplicate]

Answer 1

See Code Style Guidelines for Contributors: Follow Field Naming Conventions. The use of the "m" prefix is more specific that simply denoting a "member" variable: It's for "non-public, non-static field names."

Answer 2

The m is here to indicate a member variable.

It has 2 huge advantages:

• If you see it, you instantly recognize it as a member variable.
• Press m and you get all members via the auto completer. (This one is not in the other answers)