Java™ Phrasebook

Generating Random Numbers

Random rn = new Random(); int value = rn.nextInt(); double dvalue = rn.nextDouble();

To generate random numbers, we use the Random class found in the java.util package. By default, the Random class uses the current time of day as a seed value for its random number generator. You can also set a seed value by passing it as a parameter to the constructor of Random. The nextInt() method will produce a 32-bit integer random number.

An alternate way of generating random numbers is to use the random() method of the Math class in the java.lang package.

double value = Math.random();

This method will return a double value with a positive sign, greater than or equal to 0.0 and less than 1.0. To generate a value within a specific ...