It's Joan qianzi, right? Also known as wild persimmon, small persimmon, milk persimmon, clove persimmon, red and blue jujube, black jujube, soft jujube, milk jujube, clove jujube, jujube, jujube and so on. The fruit is green at first, light brown at first maturity and black at full maturity. Fruit can be eaten raw and tastes sweet. You can take medicine. Please enjoy the picture when its fruit is just ripe: