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Hehehe, everyone seem to be confused a bit here.
In ancient times, Japan did isolated from China and Korea time to time because Japan fed up with China bossing around. China considered itself as the center of the world, and it was true if they limited the world to asia, then. Therefore, China made every country send special presents to them regularly. Japanese kings thought it is a waste of time and resources, so it closed relation to China and Korea when they thought they learned plenty of things from China. Japan kept closed for a few or several centuries at a time. It was like “open for a few decades and close another a few centuries”.
However, China wasn’t so eager to explore its oceans, and the trade in between China and Japan wasn’t so macro-scale from at first. Only official ships that has recognized seals could enter Japan. Also, sea of Japan is a rough sea even though the distance is not so much, a history book insists.
The isolation policy was not applied to China and Korea. They were applied to westerners who brought destabilizing factors to Japan.
One of the times when Japan was isolated from China was because China forbid all trading with Japan as a punishment for some pirates residing in Japan territory.
Sakoku was the foreign relations policy of Japan under which no foreigner could enter nor could any Japanese leave the country on penalty of death. The policy was enacted by the Tokugawa shogunate under Tokugawa Iemitsu through a number of edicts and policies from 1633–39 and remained in effect until 1853 with the arrival of the Black Ships of Commodore Matthew Perry and the forcible opening of Japan to Western trade.
Source(s): http://en.wikipedia.org/wiki/Sakoku
Because it is an Island…