Clearly China likes to huff and puff, note the anti-Japanese demonstrations, destruction of their property, etc. While these public displays of anger (real or other) are not without meaning, observers of Chinese politics should not be blinded to very serious issues regarding Chinese strategy and necessity.
The Belmont Club has a fine post on China, and why it is unlikely that--despite appearances and rooster-like strutting--China will act against Taiwan. Chinas primary mission is access to energy.
Also pay special attention to this document, Straits, Passages and Chokepoints: A Maritime Geopolitics of Petroleum Distribution, which Wretchard brings to our attention (he notes especially page 8, but I say the whole thing is worth study; students of international affairs especially should pay attention!). Wretchard
has a short second post on China worth noting. I am betting that China is not amused with this news out of India.