JAVA Assignment ( stuck in some methods)

I’m working on an assignment ( JAVA ), and stuck in some methods, I need some hints/help to complete the code please!

in tester class ( VehicleTester) ==>
1- I need to write an enhanced loop to display all busses in the engineering college.
2- I need a statement to transfer the ownership of vehicle Q123 from engineering to be owned by college of education.
3- I need to write an enhanced loop that displays all the vehicle in the engineering college after the transfer of ownership.
4- I need to write a statement that displays all the info about all vehicles that use diesel fuel type across all the colleges.

my link to the project is ==> GitHub - mannaaaz/