ActionScript 2.0 :: Difference Between Private And Public Method In Custom Class

I have this sample class
Code:
class TestPrivate{
public function TestPrivate(){};
private function getGo(){
trace("can execute");
}}

And then after instantiate I just calling the method...for testing the "public" and "private" keyword purposing only...

Code:
import TestPrivate;
var obj1 = new TestPrivate();
obj1.getGo();

The result is still can be execute even though I put the private keyword in front of the methods. So what's the private keyword stands for actually...I thought it prevent been get accessed from outside...