Yes, they have.
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And now the political party that has been chipping away at that as a major part of their party platform just got a Supermajority because one of their most beloved former politicians was assassinated on live TV.
Like several people have mentioned, this was a Franz Ferdinand moment. A militarized Japan will fundamentally change the dynamics of the region. China has been utterly reliant on Japan being demilitarized and working under the presumption they'll be demilitarlized until they can invade and claim them as "always having been part of China." (IIRC, China has pulled some stunts with some of Japan's islands a few years ago, claiming they were Chinese islands and always had been, yadda yadda.)
In other words, if China wants to take over Taiwan, they might just now have a time limit. Japan as a militarized nation will NOT allow China to take the island.