Kylo Well, they are completely different language systems. For writting the answer is NO, for reading you may can understand the key meanings but not the details.
After learning Japanese, you can probably guess the meaning of a Chinese sentence. This is because a thousand years ago, Chinese characters were transmitted to Japan, and eventually Japan developed Hiragana and Katakana.
However, there have huge differences between the two languages. Their grammar is incomprehensible and their pronunciation is not exactly the same.
Here is a video about How Similar Are Chinese and Japanese?
