In what ways are Jack and Algernon alike and different?

Jack is the play's protagonist and the play's most sympathetic character. He was found in a handbag on a railway line, and feels less at home in aristocratic society than does Algernon. He lives in the country but has invented a wicked brother named "Ernest" whose scrapes require Jack's attendance in the city. Algernon, the foil to Jack, is a hedonist who has created a friend named Bunbury whose status as a permanent invalid allows Algernon to leave the city whenever he pleases. He believes this activity, "Bunburying," is necessary, especially if one is going to get married-something he vows never to do.