i made a coke vending machine and i made 2 models, one without the coke and one with the coke, i want to setblock the second block that has the coke, so i need to get witch direction is facing my block and paste it to the other block

https://imgur.com/a/Mtei9Dd

 

 

block state has getValue and setValue methods. use them to make a new state and then call world.setBlock.

but why do you have two blocks? if it's not more complicated than what you described, you have a block similar to crop or a berry bush. it can be the same block with one more state property. then, when your item is "harvested" from a block, you'd just say world.setBlock(state.setValue(AGE, 0)) and you don't worry about the rotation - it just stays the same.

how do i make the same block has 2 models for all 4 rotations? i think thats was what you mean

you would have one property that controls rotation and one that controls texture (and right-click behavior).

look into AbstractFurnaceBlock. it has one property for direction and one for functionality. (you may want to extend HorizontalBlock).
look at furnace blockstate json and furnace model json.