Most Chinese people cannot understand Japanese. However, there are some young people who are able to understand some Japanese words especially those who are interested in Japanese movies and cartoons. As for Japanese, I have no idea about their knowledge to Chinese.
I would say Chinese is to Japanese people what French is to English speaking people. I think you could sometimes understand very simple sentences or signboards in French to some limited degree with no knowledge of the language, by spotting some words that the two languages have historically shared.
The same (or at least something similar) goes for Chinese and Japanese. They have a vast amount of vocabulary in common, and a speaker of one language could sometimes figure out what is written in the other language to some extent.
If you need to understand each other perfectly, however, of course it is necessary to learn grammar, with which they have pretty much nothing in common. As for oral communication they are totally mutually intelligible.
We can understand the “Kanji” in japanese, which is same to Chinese Characters without learning the Japanese language, there are many words in Japanese consist of Kanji. However, when it comes to “Kana”, most Chinese people can understand nothing...
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Has difficulty understanding even short answers in this language.
Can ask simple questions and can understand simple answers.
Can ask all types of general questions and can understand longer answers.
Can understand long, complex answers.
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