pal.math
Class UrnModel

java.lang.Object
  extended by pal.math.UrnModel
All Implemented Interfaces:
java.io.Serializable

public class UrnModel
extends java.lang.Object
implements java.io.Serializable

class for drawing numbers from an urn with and without laying back

Version:
$Id: UrnModel.java,v 1.4 2001/07/13 14:39:13 korbinian Exp $
Author:
Korbinian Strimmer
See Also:
Serialized Form

Constructor Summary
UrnModel(int n)
          create urn model
 
Method Summary
 int drawDontPutBack()
          draw a number without putting back
 int drawPutBack()
          draws a number with putting back
 void reset()
          refill urn
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

UrnModel

public UrnModel(int n)
create urn model

Parameters:
n - capacity (corresponding to numbers 0..n-1)
Method Detail

drawDontPutBack

public int drawDontPutBack()
draw a number without putting back

Returns:
number drawn (random integer between 0..n-1, if empty return -1)

reset

public void reset()
refill urn


drawPutBack

public int drawPutBack()
draws a number with putting back

Returns:
number drawn (random integer between 0..n-1, if empty return -1)