What is the author's style in Rich Man, Poor Man by Irwin Shaw?

The language of the novel is proper for the period within which it is set. The novel takes place from the years 1945 to 1968, encompassing many years of significant change. The language includes the proper dialect of teenagers growing up in America during World War II and grows to encompass the language of a teenager living in the pre-Vietnam era. The dialogue of this novel changes with each decade, as do the attitudes of the characters living within the pages of the novel, each reflecting each other quite well.