Chapter 4: Making the Most of (Email web hosting) Variables and
Chapter 4: Making the Most of Variables and Their Values 79 Another type type float also allows you to have numbers after the decimal point, but this type isn t as accurate. (See the sidebar, Digits beyond the decimal point, for the full story.) Don t sweat the choice between float and double. For most programs, just use double. An Import Declaration It s always good to announce your intentions up front. Consider the following classroom lecture: Today, in our History of Film course, we ll be discussing the career of actor Lionel Herbert Blythe Barrymore. Born in Philadelphia, Barrymore appeared in more than 200 films, including It s a Wonderful Life, Key Largo, and Dr. Kildare s Wedding Day. In addition, Barrymore was a writer, composer, and director. Barrymore did the voice of Ebenezer Scrooge every year on radio. . . . Interesting stuff, heh? Now compare the paragraphs above with a lecture in which the instructor doesn t begin by introducing the subject: Welcome once again to the History of Film. Born in Philadelphia, Lionel Barrymore appeared in more than 200 films, including It s a Wonderful Life, Key Largo, and Dr. Kildare s Wedding Day. In addition, Barrymore (not Ethel, John, or Drew) was a writer, composer, and director. Lionel Barrymore did the voice of Ebenezer Scrooge every year on radio. . . . Without a proper introduction, a speaker may have to remind you constantly that the discussion is about Lionel Barrymore and not about some other Barrymore. The same is true in a Java program. Compare some code from Listings 3-1 and 4-2. From Listing 3-1: class Displayer { System.out.println( You ll love Java! ); and from Listing 4-2: import static java.lang.System.out; class Millionaire { out.print( You have $ ); out.print(amountInAccount); out.println( in your account. );
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