public class RandomCoin {
   /** flip a coin. */
   public static void main(String[] args) {
       java.util.Random rand = new java.util.Random();
       System.out.println(rand.nextBoolean() ? "heads" : "tails");
   }
}

Of course, if you prefer some other random type than boolean, call the
appropriate method - see the javadoc.  

If you're using it for cryptography, you might prefer SecureRandom.
--
Mark Rafn    dagon@dagon.net    <http://www.dagon.net/>

This will create you a random double.

//Creates random double.
double random = Math.random();

//Turns double into a number >=1
double Random = random * 10;

//Cast the double as an int (removes decimals)
int xOry = (int)Random;

Here would be a way to do a random number between  1 and 50

here is math in the java API to help you understand how floor and random,
etc work:
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Math.html

public class MyRandomNumbers {
   
    public static void main(String[] args) {
        int myNumber;
        myNumber = (int) Math.floor(Math.random() * 50 + 1);
        System.out.println(myNumber);
    }   

}

Then again with it being over a year later, I hope you're past this
point. ;)