Duplicated values when added to list of list

Question

Hey all,
I'm making a list of lists, when I print the values just after adding in the list of list everything seems fine, but when I print that list where I call it it has duplicate value instead of the 2 different that I see when I first print it, I really don't know what's wrong.
I tried 2 different declarations for the list of list but is the same result, I also tried using index to add the list but no change either.
What is wrong? or how should I do it instead.
Thanks in advance
The code is this
public class ReadFile extends Metrics{
    public List loadFile(String filename) throws IOException{//void
        FileInputStream fstream = null;
        ///TRACE POINTS
            List<TracePoint> CharPoints=new ArrayList<TracePoint>();
            List<List> ListaChars = new ArrayList<List>();
            //List<List<TracePoint>> ListaChars = new ArrayList<List<TracePoint>>();
        try {
            fstream = new FileInputStream(filename);//"xy.dat");
            DataInputStream in = new DataInputStream(fstream);
            BufferedReader br = new BufferedReader(new InputStreamReader(in));
            String strLine;
            Normalize norm = new Normalize();
       //Read File Line By Line
            while((strLine = br.readLine())!= null) {
                int INDEX=0;
                ///READING VALUES FROM XY FILE and splittting
                String[] temp = strLine.split(" ");
                ///clear list before reusing it
                CharPoints.clear();
                String[] tempNorm = norm.normalize(temp, 0, 1);
                for (int i = 1 ; i < tempNorm.length ; i=i+2){
                    CharPoints.add(new TracePoint(Float.parseFloat(tempNorm),Float.parseFloat(tempNorm[i+1])));
ListaChars.add(INDEX, CharPoints);
System.out.println(" Charpoints is "+ CharPoints);
System.out.println(" LISTofCHARS is "+ ListaChars);
INDEX++;
//Close the input stream
in.close();
}catch (FileNotFoundException ex) {
Logger.getLogger(ReadFile.class.getName()).log(Level.SEVERE, null, ex);
}finally {
try {
fstream.close();
} catch (IOException ex) {
Logger.getLogger(ReadFile.class.getName()).log(Level.SEVERE, null, ex);
//return CharPoints;
return ListaChars;
public static void main(String args[]) throws IOException{
ReadFile test2 = new ReadFile();
List<List> characters = new ArrayList<List>();
characters = test2.loadFile("xy.dat");
//System.out.println("\ncharacters = " +" "+ characters.get(0));
The result is this, the first look like its copying ok, but when the second is added is duplicated and the first value is not there anymoreCharpoints is [TracePoint: 0.395683, 0.913669, 0.000000, TracePoint: 0.136691, 0.928058, 0.000000, TracePoint: 0.000000, 1.000000, 0.000000]
LISTofCHARS is [[TracePoint: 0.395683, 0.913669, 0.000000, TracePoint: 0.136691, 0.928058, 0.000000, TracePoint: 0.000000, 1.000000, 0.000000]]
Charpoints is [TracePoint: 1.000000, 0.004096, 0.000000, TracePoint: 0.999937, 0.003151, 0.000000, TracePoint: 0.999811, 0.001765, 0.000000, TracePoint: 0.998866, 0.000000, 0.000000]
LISTofCHARS is [[TracePoint: 1.000000, 0.004096, 0.000000, TracePoint: 0.999937, 0.003151, 0.000000, TracePoint: 0.999811, 0.001765, 0.000000, TracePoint: 0.998866, 0.000000, 0.000000], [TracePoint: 1.000000, 0.004096, 0.000000, TracePoint: 0.999937, 0.003151, 0.000000, TracePoint: 0.999811, 0.001765, 0.000000, TracePoint: 0.998866, 0.000000, 0.000000]]
Edited by: mtiv on Oct 24, 2009 6:02 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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

Answer 1

while((strLine = br.readLine())!= null) {
                int INDEX=0;
                INDEX++;
}On each iteration of the while loop, index equals 0. Try moving the variable index outside of the while loop.
List<TracePoint> CharPoints=new ArrayList<TracePoint>();By convention variable names begin with a lower case letter, it is an important practise to live by as I was lead to believe CharPoints was a class at first.
Mel