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Random Class

Iqbal Ali
Greenhorn

Joined: Aug 21, 2001
Posts: 9
When you have math.random() method to generate random numbers, why we still have a Random class? Isn't it inefficient?
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Michael Fitzmaurice
Ranch Hand

Joined: Aug 22, 2001
Posts: 168
Hi Iqbal
The java.lang.Math class has only the one method for generating randon numbers (<code>random()</code>), which returns a double value greater than or equal to 0.0 and less than 1.0. Generating random numbers is only a small part of the overall functionality it affords the programmer.
As you have rightly noticed, The Java.util.Random class can do the same thing, via the <code>nextDouble()</code> method. However, the Random class also provides further methods to generate random booleans, floats, ints, bytes, ints between a range specified by the user, and various other bits and pieces. It is therefore a specialised class dealing only with the generation of random values.
If you only need to generate a random double, then it is cheaper and easier to use the static method of the Math class. However, if you wanted to generate a series of random values of different types, then creating and using an instance of Random is a convenient way to do it.

Hope this helps.

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