How did holden want to kill himself?

Holden Caulfield, the protagonist of "The Catcher in the Rye" by J.D. Salinger, mentions different methods of wanting to kill himself throughout the novel, but he never follows through with any of them. Some methods he considers include jumping out of a window or off a cliff, shooting himself, drowning, or jumping out of a cab if he'll "meet a cliff on the other side." His thoughts on suicide stem from his feelings of alienation, despair, and a desire to escape the pressures and phoniness of the adult world.