Optimization: access to fields against methods

Question

I know optimization rule # 1: don't do this! But I thought it was a simple question, and if I start using the faster method, now I can save a lot of CPU time when I finish.

I am doing an RPG and saying this is part of a custom class:

public class Baddie{

    int health;
    int magic;

    public Baddie(int health, int magic){
        this.health = health;
        this.magic = magic;
    }

    public int getHealth(){
        return health;
    }

Now the answer to my question may be "there is no difference", and it is wonderful with me .. I just want to know. Get Buddy's health faster by accessing the fields:

//Somewhere in the main thread, I get an instance of Baddie..
Baddie b = getScaryBadGuy();
int baddieHealth = b.health;

Or is it faster to use the return method?

int baddieHealth = b.getHealth();

Answer 1

Copied and pasted from Design for Performance :

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