China is stuck back in the past.
Only in regards to territorial claims - which is logical since "the Poor man of Asia" got robbed blind by those imperialists in the 18th to 20th century. Factually China at many times was in sole control throughout centuries in regards to the South-China-Sea.
Hates Japan more than anyone else, why? Because of what happened in WW2.
No - absolutely not, they love to buy Japanese products, make holiday in Japan, and thrive to integrate Japanese innovations into their own culture.
If however Japan bows to US pressure or tends to become their stooge/tool - China will face them with their genocidal deeds of WW2.
Check this out, I'm learning Chinese and this is a little difficult for me, but it has English subtitles, or Chinese subtitles if you can.
Mandarin is an extreme difficult language (at least for me) - even after 20 years in China and 15 years in South-east-Asia, I am nowhere prefect in regards to Mandarin. - so good luck to you
History is a big anchor for Chinese imperialism. They HATE imperialism, for obvious reasons, but still want to annex loads of land. The South China Seas is hilarious, they "found a map" and the BBC went to interview the dude with the map, and he said he threw it away because you couldn't make anything out from it.
See above
The Senkaku Islands, or the Diaoyu Islands (the fishing islands) were called the Senkaku Islands (Japanese) by Mao. When they realized the islands were strategic, might have oil etc, the Chinese suddenly went for history and found a few excuses for why they're Chinese.
China has always referred to them as Diaoyu islands - the Japanese refer to them as Senkaku Islands.
Chinese kids know two places on a map of China. Taiwan and Xinjiang. Why? Because they're what the government wants to make sure everyone knows are Chinese.
According to who? and e.g. Taiwan and Xinjiang have been named and marked as Chinese provinces for centuries and a thousand years and more on Chinese maps.
Just as a European map from the 14th century will show the Baltic States, most of today's Poland, Czechoslovakia, Northern Italy, and parts of today's France to belong to the German aka Holy Roman Empire of German Nations.
Whilst the Holy Roman Empire was dissolved forcefully by e.g. France, Britain, and Sweden in 1648 and reanimated in parts in 1871 - as the German Reich, today's China is the legal and unbroken successor of e.g. the Tang Dynasty of the 13th century incl. it's claim towards robbed territories.
History is SUPER IMPORTANT for their justifications.
As for anybody else just as well - see Trump and the Panama canal, or the US claims and territorial possessions in e.g. the Pacific, having resulted out of "robbing" - well the USA will prefer the term "claiming" former German colonies as their bounty after WW1.
Who is on the banknotes? Mao, still. Why? Xi uses Mao as his justification for control and power.
Off course - since in the present Chinese population Mao is still being viewed as the Papa of the "reunited & liberated" Chinese nation.