org.generation5.demos
Class EvoHelloWorld

java.lang.Object
  org.generation5.bio.EvolveStandard
      org.generation5.demos.EvoHelloWorld

All Implemented Interfaces:

java.lang.Comparable, Evolvable

public class EvoHelloWorld

extends EvolveStandard

Attempts to evolve a target string, defaulting to "Hello World!". All valid digits are acceptable inputs for the string.

Field Summary

protected java.lang.StringBuffer	dataString The mutable data string.
protected static java.lang.String	targetString The target string to evolve.

Fields inherited from class org.generation5.bio.EvolveStandard

fitnessValue, minimizeFitness, random

Constructor Summary

EvoHelloWorld()
Creates a new instance of EvoHelloWorld

Method Summary

void	calculateFitness() The fitness is calculated as the sum of the differences between the data string and the target string.
static java.lang.String	getTargetString() Return the target string being evolved.
static void	main(java.lang.String[] args) Run the genetic algorithm with a target string.
Evolvable	mate(Evolvable partner) Mate two strings with a simple one-point crossover.
void	mutate() Mutate this string between -2 and +2 characters.
void	randomInitialize() Initialize the string to a random collection of characters.
static void	setTargetString(java.lang.String ts) Set the target string.
java.lang.String	toString() Return an immutable version of dataString.

Methods inherited from class org.generation5.bio.EvolveStandard

compareTo, getFitness

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

dataString

protected java.lang.StringBuffer dataString

The mutable data string.

targetString

protected static java.lang.String targetString

The target string to evolve.

Constructor Detail

EvoHelloWorld

public EvoHelloWorld()

Creates a new instance of EvoHelloWorld

Method Detail

main

public static void main(java.lang.String[] args)

Run the genetic algorithm with a target string. The best population member is printed for every iteration.

Parameters:

args - the command line arguments

calculateFitness

public void calculateFitness()

The fitness is calculated as the sum of the differences between the data string and the target string.

Specified by:

calculateFitness in interface Evolvable

Specified by:

calculateFitness in class EvolveStandard

mate

public Evolvable mate(Evolvable partner)

Mate two strings with a simple one-point crossover.

Specified by:

mate in interface Evolvable

Specified by:

mate in class EvolveStandard

Parameters:

partner - the partner string to mate with.

Returns:

the new child string.

mutate

public void mutate()

Mutate this string between -2 and +2 characters.

Specified by:

mutate in interface Evolvable

Specified by:

mutate in class EvolveStandard

randomInitialize

public void randomInitialize()

Initialize the string to a random collection of characters. The size of the string is fixed to that of the target string.

Specified by:

randomInitialize in interface Evolvable

Specified by:

randomInitialize in class EvolveStandard

toString

public java.lang.String toString()

Return an immutable version of dataString.

Returns:

the data string.

See Also:

dataString

getTargetString

public static java.lang.String getTargetString()

Return the target string being evolved. This defaults to "Hello World!".

Returns:

the target string.

setTargetString

public static void setTargetString(java.lang.String ts)

Set the target string.

Parameters:

ts - the new target string.