Below is the syntax highlighted version of RandomInt.java
from §1.2 Built-in Types of Data.
/****************************************************************************** * Compilation: javac RandomInt.java * Execution: java RandomInt N * * Prints a pseudo-random integer between 0 and N-1. * Illustrate an explicit type conversion (cast) from double to int. * * % java RandomInt 6 * Your random integer is: 5 * * % java RandomInt 6 * Your random integer is: 0 * * % java RandomInt 1000 * Your random integer is: 129 * * % java RandomInt 1000 * Your random integer is: 333 * ******************************************************************************/ public class RandomInt { public static void main(String[] args) { // a positive integer int n = Integer.parseInt(args[0]); // a pseudo-random real between 0.0 and 1.0 double r = Math.random(); // a pseudo-random integer between 0 and n-1 int value = (int) (r * n); System.out.println(value); } }