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#1
March 13th, 2002, 10:52 AM
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getting Random ints
I built a class to model a six-sided dice. I am trying to build a reliable "roll()" function that will set the visible side according using the Random class in java.util.*.
I can instantiate a Random object, and get the range I want by doing a Random.nextInt(7), however I have observed that when I run this in a loop I do not get the psuedo-random distribution I would expect. Instead I get consectutive results that contain 2,3,4 and sometimes 5 of the SAME number in a row. Does anyone know how to rememdy this problem? Thanks. Brett
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#2
March 14th, 2002, 11:34 AM
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Ha! I am answering my own question...
The deal with java.util.Random is that it needs to be created as a class componant, and not inside a method. Otherwise, since it is psuedo random algorithm, you will get some not so random results if you recreate the object every time you call the method. Code:
package diceGame
import java.util.*;
public class RollableDice extends SixSidedDice
{
// constructor
public RollableDice()
{
super();
}
// command
public void roll()
{
this.setVisibleSide(this.randGenerator.nextInt(6)+1);
}
// componant
Random randGenerator = new Random(System.currentTimeMillis());
}
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#3
March 16th, 2002, 01:19 AM
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Quote:
I have it in that situation for one of my scripts now  Gotta fix that.
__________________
K1
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#4
March 30th, 2002, 01:17 AM
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u can try this ...
r.nextInt(1000) % 7; i am sure..u will not have that repetition problems... if u r still not satisfied with the result try changin the 1000 to 10000...
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