How does Java Compiler deal with circular dependence?

A simple example is in the most basic class Object, you have a toString() method which uses String class, but, a String is an Object class first. So when the compiler encounters this circular dependence situation, how does it deal with it?
Anyone has some ideas?

I studied this a while ago... I think I know the answer, but you can still confirm it.
Suppose you said javac Object.java, the first thing it would do is load the file into memory and layout its functions. Then it will search for dependencies. Finding String on in the classpath, it loads that up into memory too. It then searches for String's dependencies and so on...

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