1. If you like the French language:
* J'aime le français. (Formal)
* J'aime le français. (Informal)
2. If you like French culture or things in general:
* J'aime la France. (I like France)
* J'aime les choses françaises. (I like French things)
3. If you like the French style:
* J'aime le style français. (I like the French style)
Remember that "le" is the masculine definite article for "French" when referring to the language, while "la" is the feminine definite article when referring to France or things associated with France.