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I’ve seen some developers put instance variable declarations at the end of classes though I mostly see them placed at the top. The only reasons I can think of for doing this are stylistic preference or maybe it somehow makes them easier to work with in an IDE. Is there a more legitimate reason for choosing this style?
Because of ‘Program to an ‘interface’, not an ‘implementation’.’ (Gang of Four 1995:18) (http://en.wikipedia.org/wiki/Design_Patterns#Introduction.2C_Chapter_1), some people prefer to declare instance variables at the bottom of the class. the theory being that the user of a class is more interested in what they can do with the class(methods) as opposed to how something is done(variables). Placing the methods at the top of the class exposes them first to the user when they look at the code.