RandomThings.java

public class Test {
    public static String evenOrOdd(int val) {
        if (0 == (val % 2)) {
            return "even";
        }
        return "odd";
    }
    public static String evenOrOdd(long val) {
        if (0 == (val % 2)) {
            return "even";
        }
        return "odd";
    }

    public static int getoptNumLoops( String [] args, int defaultValue) {
        if (args.length > 0) {
            try {
                return Integer.parseInt(args[0]);
            }
            catch (Exception e) {
                // ignore or otherwise disregard the exception, one of the
                // worst possilbe things a professional software engineer can
                // do :-D
            }
        }
        return defaultValue;
    }

    public static void main ( String [] args ) {
        java.util.Random rnd;
        int numLoops = getoptNumLoops(args, 4);

        System.out.println("doubles between 0 and 1");
        for (int ii = 0; ii < numLoops; ++ii) {
            System.out.println("java.lang.Math.random() = " + java.lang.Math.random());
        }
        System.out.println("");

        System.out.println("doubles scaled to integers from 1 to 100");
        for (int ii = 0; ii < numLoops; ++ii) {
            int val = (int)(java.lang.Math.random() * 100.0);
            System.out.println("java.lang.Math.random() = " + val + " " + evenOrOdd(val));
        }
        System.out.println("");


        System.out.println("int type");
        rnd = new java.util.Random();
        for (int ii = 0; ii < numLoops; ++ii) {
            int val = rnd.nextInt();
            System.out.println("rnd.nextInt() = " + val + " " + evenOrOdd(val));
        }
        System.out.println("");

        System.out.println("long type");
        rnd = new java.util.Random();
        for (int ii = 0; ii < numLoops; ++ii) {
            long val = rnd.nextInt();
            System.out.println("rnd.nextLong() = " + val + " " + evenOrOdd(val));
        }
        System.out.println("");
    }
}