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If the students are expected to start in 2014 and do 4 years of university, then they would be the class of 2018.

They'll join in the Fall of 2014. Graduate in the Spring of 2018.

Thus. Class of 2018.

If you go to school in the fall of 2014, it's likely you'll graduate in 2018.

It's an American thing: your class is the expected year you will graduate, not the year you entered as in other parts of the world (like China).

In the US, college classes are numbered by graduation year, presumed to be 4 years after the start. So Fall 2014 starters would be class of 2018.