Converting Binary To Ascii but Getting Same Result for all bit strings

Converting Binary To Ascii but Getting Same Result for all bit strings

I am doing a little project where I have to write a Genetic Algorithm to
evolve my name and id number. Basically I'm randomly generating bit
strings which have to then be generated into strings of ascii characters
and measure to see how close the generation gets. I will then mutate the
best 10 generations to try and get it as close as possible to my name and
id.
The bit I am having trouble with at the moment is the ascii generation. It
works fine for the first bit string but then just repeats itself for the
rest of them despite the fact that each bit string is different. Can
anyone see the problem? Any help is much appreciated.
Code so far:
import java.util.Random ;
public class GeneticAlgorithm {
public static void main(String[] args) throws Exception
{
int popSize = 0 ;
int gen ;
double repRate ;
double crossRate ;
double mutRate ;
int seed = 9005970 ;
String id = "John Connolly 00000000" ;
int bits = 7 * id.length() ;
String output ;
int pop ;
int bitGen ;
Random rand = new Random(seed) ;
ConvertToAscii convert = new ConvertToAscii() ;
Fitness fit = new Fitness() ;
try {
popSize = Integer.parseInt(args[0]) ;
if(popSize < 0 || popSize > 100000)
{
System.out.print("Invalid number! A positive number
between 0 and 100000 must be used for the population
rate!") ;
System.exit(1) ; // Signifies system exit if error occurs
}
gen = Integer.parseInt(args[1]) ;
if(gen < 0 || gen > 100000)
{
System.out.println("Invalid number! A positive number
between 0 and 100000 must be used for the generation
rate!") ;
System.exit(1) ;
}
repRate = Double.parseDouble(args[2]) ;
if(repRate < 0 || repRate > 1.0)
{
System.out.println("Invalid number! A positive decimal
point number between 0 and 1.0 must be used for the
reproduction rate!") ;
System.exit(1) ;
}
crossRate = Double.parseDouble(args[3]) ;
if(crossRate < 0 || crossRate > 1.0)
{
System.out.println("Invalid number! A positive decimal
point number between 0 and 1.0 must be used for the
crossover rate!") ;
System.exit(1) ;
}
mutRate = Double.parseDouble(args[4]) ;
if(mutRate < 0 || mutRate > 1.0)
{
System.out.println("Invalid number! A positive decimal
point number between 0 and 1.0 must be used for the
mutation rate!") ;
System.exit(1) ;
}
if(repRate + crossRate + mutRate != 1.0)
{
System.out.println("The Reproduction Rate, Crossover Rate
and Mutation Rate when sumed together must equal 1.0!") ;
System.exit(1) ;
}
output = args[5] ;
java.io.File file = new java.io.File(output);
java.io.PrintWriter writeOut = new java.io.PrintWriter(file) ;
StringBuffer bitString = new StringBuffer() ;
int bestFit = 0, fitness = 0, totalFit = 0 ;
String ascii = "" ;
writeOut.println(popSize + " " + gen + " " + repRate + " " +
crossRate + " " + mutRate + " " + output + " " + seed) ;
for(pop = 0 ; pop < popSize ; pop++)
{
ascii = "" ;
writeOut.print(pop + " ") ;
for(int i = 0 ; i < bits ; i++)
{
bitGen = rand.nextInt(2);
writeOut.print(bitGen) ;
bitString.append(bitGen) ;
}
ascii = convert.binaryToASCII(bitString) ;
writeOut.print(" " + ascii) ;
writeOut.println() ;
}
writeOut.close() ;
System.exit(0) ;
} catch(ArrayIndexOutOfBoundsException e) {
System.out.println("You have entered the incorrect number of
arguments!") ;
System.out.println("Please enter the required 6 arguments.") ;
System.exit(1) ;
} catch(NumberFormatException n) {
System.out.println("Invalid argument type") ;
System.exit(1) ;
}
}
}
Here is the conversion code:
public class ConvertToAscii {
public String binaryToASCII(StringBuffer bitString)
{
String ascii = "" ;
String byteString ;
int decimal ;
int i = 0, n = 7 ;
int baseNumber = 2 ;
char asciiChar ;
while(n <= 154)
{
byteString = bitString.substring(i, n) ;
decimal = Integer.parseInt(byteString, baseNumber) ;
System.out.print(" " + decimal) ;
i += 7 ;
n += 7 ;
if(decimal < 33 || decimal > 136)
{
decimal = 32 ;
asciiChar = (char) decimal ;
} else {
asciiChar = (char) decimal ;
}
ascii += asciiChar ;
}
return ascii ;
}
}