In the very end Holden, the narrator, reveals that he is actually all the time of retelling the events of those couple days in some kind of psychiatric institution, talking to a doctor (possibly). We can’t be sure about the ending. You simply have to interpret it by yourself. Review (my opinion):
I really enjoyed reading this book. It is written in everyday English with some usage of slang, which makes it quite easy to read. Right from the beginning I forgot it was written by J.D.Salinger, because I felt as if it were all written by Holden himself. The author gives you a clear idea of what is going on in Holdens mind.
My favourite character was Phoebe, though. She seems to be really cute, but serious at the same time. I liked the part where she’s walking on the other side of the street to show she disagrees with Holden. That gives her character.