Check out a file as it was on a specific commit | The Git Checkout Command
Sometimes you want to check out a file as it was on a specific commit. You can do this easily by using the Git checkout command:
git checkout commitSha -- insertFileNameHere
To check out the file Controller.java, you could do the following:
git checkout 61b04017a359339d191143cc5a2269bf06acd9e2 -- Controller.java
For full reference see Git checkout documentation.