This week's book giveaway is in the Agile and other Processes forum. We're giving away four copies of The Mikado Method and have Ola Ellnestam and Daniel Brolund on-line! See this thread for details.
When you have math.random() method to generate random numbers, why we still have a Random class? Isn't it inefficient? ------------------
-----<br />If you think education is expensive, try ignorance.
Michael Fitzmaurice
Ranch Hand
Joined: Aug 22, 2001
Posts: 168
posted
0
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.
------------------ "One good thing about music - when it hits, you feel no pain" Bob Marley
"One good thing about music - when it hits, you feel no pain" <P>Bob Marley
I agree. Here's the link: http://ej-technologies/jprofiler - if it wasn't for jprofiler, we would need to
run our stuff on 16 servers instead of 3.
0
