Chinese olives taste different than Western olives. There is a hint of five spice and very little of the Mediterranean flavor tones.
The olives come in two forms, canned with pits and dry packed. The whole olive with seed is good for rice soup, where you need the presentation. However, if you are looking to make a Chinese olive fried rice,the dry packed ones make sense. They look more like a paste than individual olives. I have only seen the canned olive available here in the US. In Thailand you can also get the dry pack ones, imported from China.