DataScience/clustering/DataFileReader.java

import java.io.*;
import java.util.ArrayList;

public class DataFileReader {
    static ArrayList<ArrayList<Double>> readFile(String file){
        ArrayList<ArrayList<Double>> data = new ArrayList<ArrayList<Double>>();
        //Count: leere Zeilen werden nicht mitverwendet
        int count = 0;
        try(BufferedReader stream = new BufferedReader(new FileReader(file))){
            while(true){
                String line = stream.readLine();
                if(line == null){
                    break;
                }
                if(!line.contains("#")){
                    String[] parts = line.split("[ |\t]");
                    data.add(new ArrayList<Double>());
                    for(String s : parts){
                        try{
                            data.get(count).add(Double.parseDouble(s));
                        }catch(NumberFormatException e){
                        }
                    }
                    if(data.get(count).size() == 0){
                        data.remove(count);
                    }else{
                        count++;
                    }
                }
            }
        }
        catch(FileNotFoundException e){
            e.printStackTrace();
            System.out.println("file " + file + " not found");
        } catch (IOException e) {
            e.printStackTrace();
        }
        return data;
    }
}