January 2014
Intermediate to advanced
736 pages
70h 43m
English
Content preview from Android™ How to Program, Second Edition
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D.9.1. Scaling and Shifting of Random Numbers
To demonstrate random numbers, let’s show to simulate rolling a six-sided die. We begin by using nextInt to produce random values in the range 0–5, as follows:
face = randomNumbers.nextInt( 6 );
The argument 6—called the scaling factor—represents the number of unique values that nextInt should produce (in this case six—0, 1, 2, 3, 4 and 5). This manipulation is called scaling the range of values produced by Random method nextInt.
A six-sided die has the numbers 1–6 on its faces, not 0–5. So we shift the range of numbers produced by adding a shifting value—in this case 1—to our previous result, as in
face = 1 + randomNumbers.nextInt(
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