I caught a finch, could be wild or one of my lost ones.

[AGG]

Looks like a Java finch to me. I don't think they are native to Australia although there may be a wild population. @Teila or @JaeG may have better insight.

He's a zebra finch

 

[JaeG]

Love your coat hanger perch! That's a great idea! If it's that tame I'd say it's an escaped one. Wild raised birds are very skittish around humans and you'd have to work pretty hard bribing a wild bird with food before you could even look straight at it without it freaking out and flying away. It's possibly been trying to get to your ones food as escapees don't know how to find food for themselves in the wild and generally don't live very long. I'm glad you've caught it (whether it's yours or whether it's an escapee from someone else's aviary/home).

 

[Coturnix Quail]

He's a zebra finch

You got that right.