http://en.wikipedia.org/wiki/Oracle_v._Google
Sun settled with Microsoft before a verdict was reached, so the question of IP and if alternate implementations of a language syntax is allowed wasn't answered then.
In the antitrust suit, all that was answered was that Microsoft used its advantage with its operating system monopoly to push its version of the Java runtime. The effect was that Microsoft were not allowed to bundle their runtime, but had to offer users the choice - they were not found to be violating Sun's IP in implementing a runtime.
Syntax of a programming language not being IP protected is probably a good thing for developers, regardless of what you think of the Microsoft situation. The API being protected is a separate issue, as is the trademark on the name (which applied in the Microsoft case but not in Google's since they didn't use the trademark term in their implementation)