September 2021
Beginner
560 pages
12h 4m
English
Content preview from Beginning Programming with Java For Dummies, 6th Edition
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Chapter 17
How to Flick a Virtual Switch
IN THIS CHAPTER
Dealing with many alternatives
Jumping out from the middle of a statement
Handling alternative assignments
Imagine playing Let’s Make a Deal with ten different doors: “Choose door number 1, door number 2, door number 3, door number 4 — wait! Let’s break for a commercial. When we come back, I’ll say the names of the other six doors.”
What Wayne Brady (the show’s host) needs is Java's switch statement.
Meet the switch Statement
The code in Listing 9-2 (refer to Chapter 9) simulates a fortune-telling toy — an electronic oracle. Ask the program a question and the program randomly generates a yes-or-no answer. But, as toys go, the code in Listing 9-2 isn't much fun. The code has only two possible answers. There’s no variety. Even the earliest talking dolls could say about ten different sentences.
Suppose that you want to enhance the code of Listing 9-2. The call to myRandom.nextInt(10) + 1 generates numbers from 1 to 10. So maybe you can display a different sentence for each of the ten numbers. A big pile of if statements should do the trick:
if (randomNumber == 1) { System.out.println("Yes. Isn't it obvious?");}if (randomNumber ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.