Bloomberg has the details:
"China surpassed Japan as the world’s second-largest economy last quarter, capping the nation’s three- decade rise from Communist isolation to emerging superpower.
Japan’s nominal gross domestic product for the second quarter totaled $1.288 trillion, less than China’s $1.337 trillion, the Japanese Cabinet Office said today. Japan remained bigger in the first half of 2010, the government agency said. Japan’s annual GDP is $5.07 trillion, while China’s is more than $4.9 trillion.
China led the world out of last year’s global recession with an economy that’s more than 90-times bigger than when leader Deng Xiaoping ditched hard-line Communist policies in favor of free-market reforms in 1978. The country of 1.3 billion people will overtake the U.S., where annual GDP is about $14 trillion, as the world’s largest economy by 2027, according to Goldman Sachs Group Inc. chief economist Jim O’Neill.
China’s surpassing of Japan “is a marker of its increasingly dominant role in the global economy,” said Eswar Prasad, a senior fellow at the Brookings Institution and former head of the China division at the International Monetary Fund. “The resilience of China’s growth during the crisis enabled a number of other countries, particularly commodity-exporting economies, to ride on its coattails...”"
According to a PricewaterhouseCoopers report cited by Bloomberg, China is expected to overtake the US as the world's largest economy sometime around 2020.