Whats the situation if usa does not export any of goods to japan?

First, let's look at the likelihood of the US, which is having enough financial problems already, deciding that "Hey, let's throw away the Japanese segment of our market!". Is it likely? Feasible? Remotely possible? Why ask a question in which the answer is moot. But to make you happy...... The US would lose money and, for the most part, Japan would simply find another source. And I KNOW of a source for 'silliness' in case Japan has the need for any of that.

You have a basic misunderstanding about Japan-US trade relations. Since the early 1980's, the US has been in enormous trade deficit with Japan, which means the amount of US export to Japan has been far smaller than your import from Japan. This huge trade imbalance had been the biggest problem for Japan-US economic relations up until 2003 or 2004 when China exceeded Japan in terms of the trade imbalance with the US. In the 1980's, approx 30% of Japan's international trade was made with the US, which means Japanese economy back then was heavily relying on the US. However, the ratio has dropped drastically over the past 10+ years as Japan-China (and Japan-EU) trade showed a rapid increase. In fact, US share in the entire amount of Japan's international trade in 2009 shrank to as low as 13.5%. In the same year, China's share in Japan's trade balance jumped to 23.4%, compared with 10% in 1990. Whether you have a basic knowledge of international economy or not (you don't sound like it, unfortunately), I hope you can guess what these facts suggest.

-if USA declines to send its product to Japan, America will lose money -they imports clothes mostly from China because it is cheaper than manufacturing herein Japan. <>some products that are made in some parts of Asia, like watches, the movement is from Japan but just assembled in other countries to save the cost.