Reading input file into an array

[littlefire]

Hi

Can you read the text from an input file into an array in an abstract class constructor or can you only read it in in a main class.

[ojn]

What happens when you try?

[littlefire]

its not working. if we create an abstract constructor it looses the values after one iteration so i created it in main class but i can't pass it through to abstract class. i thought it might be to do with the string args in the main class?

[Norm]

its not working

You'lll have to describe it a bit more than that.
Posting the code would be useful for anyone wanting to help.

[littlefire]

this is the main class

package zeroopt.tester;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.StringTokenizer;

import zeroopt.functions.*;
import zeroopt.io.InputFile;
import zeroopt.io.OutputFile;


public class ZeroOptTest
{
public static void main( String[] args )
{
String inputFileName;
String outputFileName;

if ( args.length == 0 )
{
inputFileName = "C:\\Numerical_Analytics\\deirdre.txt";
outputFileName = "swnum_1.out";
}
else if ( args.length == 1 )
{
inputFileName = args[0];
outputFileName = "swnum_1.out";
}
else
{
inputFileName = args[0];
outputFileName = args[1];
}


double xTolerence;
String inputs[] = new String[4];

String inputfilename = args[0];

System.out.println("our filename is:"+ inputfilename);

//FileReader fr;
// BufferedReader br;
int counter = 0;
int maxIts;
int i = 0;
double xTolerance;
String filename = "C:\\Numerical_Analytics\\deirdre.txt";
FileReader fr = null;
BufferedReader br;
{
// String filename = "C:\\Numerical_Analytics\\deirdre.txt";

try {
fr = new FileReader (filename);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
br = new BufferedReader( fr );
String line;
try {
while ( (line = br.readLine()) != null )
{
StringTokenizer st = new StringTokenizer( line );
while ( st.hasMoreTokens() )
{
//maxits = ( st.countTokens() );
//maxits = Integer.parseInt(st.hasMoreTokens()) ;
//inputs [i] = Integer.parseInt(st.nextToken()) ;
inputs [i] = st.nextToken() ;
System.out.println( "deirdre inputs"+ inputs[i] );
i++;
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}


maxIts = Integer.parseInt(inputs[0]);

xTolerance = Double.valueOf(inputs[1].trim()).doubleValue();


try
{
xTolerance = Double.valueOf(inputs[1].trim()).doubleValue();
//System.out.println( "xTolerance "+ xTolerance );
}
catch (NumberFormatException nfe)
{
System.out.println( "NumberFormatException: "
+nfe.getMessage());
}


System.out.println( "maxIts deirdre "+ maxIts );
System.out.println( "xTolerance deirdre"+ xTolerance );



InputFile inFile = new InputFile( inputFileName );
OutputFile outFile = new OutputFile( outputFileName );



ZeroOpt_f g = new ZeroOpt_f( inFile, outFile);
ZeroOpt_f0 h = new ZeroOpt_f0( inFile, outFile);

System.out.println( "Bisect f is " + g.zeroBisect() );
System.out.println( "Bisect f0 is " + h.zeroBisect() );


System.out.println( "Secant f is " + g.zero2Secant() );
System.out.println( "Secant f0 is " + h.zero2Secant() );
outFile.closeWriter( );
inFile.closeReader( );

} // end of method main()
}
}


THIS IS ONE OF THE ABSTRACT METHODS IN OUR ABSTRACT CLASSES
public
double zeroBisect()

{

double x = 0;

System.
out.println("maxits is " + maxIts);

for (int i = 1; i < maxIts; i++)

{

x=
a+(b-a)/2.0;

if (f(x) ==0.0)

{

return x;

}

else

{

if ((f(a)<0.0 && f(x) > 0.0 )|| (f(a)> 0.0 && f(x) < 0.0))

{

b = x;

}

else

{

a = x;

x =
a+(b-a)/2.0;

}

if (Math.abs(a-b) < xTolerance){

return x;

}

}

}

return x;

}
/*end method zeroBisect*/

[DarrylBurke]

Just another cross poster
New To Java - reading input file into an array

db

[Norm]

You'lll have to describe the problem.