I've seen a whole lot of questions in this website about good retirement investments in a range of countries, but none asking about Australia.

Let me explain a little further my doubts:
I'm currently 21 and studying for a BsC in Computer Science in Brazil. I'm planning to get my working visa for Australia as soon as i graduate and I'm not planning to return to this country (you can imagine the reasons, huh). The problem is that i'm curious about how aussies manage to get a good income after retirement.
I've done a lot of research about retirement plans on Australia but haven't found a single option that convinced me that **that's** the best option. 

Given a scenario that working as a programmer (my current job and hopefully the one i spend the rest of my life doing!) and earning a ~100k AU$ P/Y (that's a low bet, just for the sake of this example) during my working years, what would be a good investment to ensure a good retirement for me and my partner ? By good, i mean a monthly income that can pay my bills while also giving me the option to travel once in a while, change my car or whatever.

Buying apartments and renting them (shared accomodations or whatever)? Stocks? 

Despite this question being **very** specific, i'm not expecting a **very** specific question, since economy is changing everyday and what is a good investment today may not be tomorrow. I just want to know the opinion of an Australian regarding future planning.
Thanks in advance!