Récupérer informations d'un fichier

1000
124 13
156 14
138 13 
143 14 
231 25 
214 20 
98 10 
178 16 
205 19 
189 17 
163 16 
112 12 
201 16 
302 29 
222 23

int capacity

double[] weight

double[] value

capacity = 15
weight = [124.0, 156.0, 138.0, 143.0, 231.0, 214.0, 98.0, 178.0, 205.0, 189.0, 163.0, 112.0, 201.0, 302.0, 222.0]
value = [13.0, 14.0, 13.0, 14.0, 25.0, 20.0, 10.0, 16.0, 19.0, 17.0, 16.0, 12.0, 16.0, 29.0, 0.0]

package com.company;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class Backpack {

    private int capacity;

    private double[] weight;
    private double[] value;


    /**
     * construtor of the backpack from the file
     */
    public Backpack(File file) throws FileNotFoundException {

        // note: scan data from file
        Scanner scan = new Scanner(file);
        String sentence = "";
        int nbOfElt = -1; //note: because first line doesn't count
        while (scan.hasNextLine()){
            sentence = sentence + scan.nextLine()+" ";
            nbOfElt++;
        }
        System.out.println(nbOfElt);

        // note: retrieval of capacity (first four char of the file)
        String capacityString = sentence.substring(0,4);
        this.capacity = Integer.parseInt(capacityString);


        // note: retrieval of weight and value in one String array
        sentence = sentence.substring(4);
        String[] weightAndValue = sentence.split("\\s");


        // note: weight = even index
        // note: value = odd index
        double[] specsD = new double[weightAndValue.length];
        int d = 0;
        for (int i = 0; i < weightAndValue.length; i++) {
            if (!weightAndValue[i].isEmpty()){
                Double data = Double.parseDouble(weightAndValue[i]);
                double dataD = (double) data;
                specsD[d] = dataD;
                d++;
            }

        }


        this.weight = new double[nbOfElt];
        int w = 0;
        this.value = new double[nbOfElt];
        int v = 0;

        for (int i = 0; i < specsD.length; i++) {

            if (i%2==0){ //note: even index = weight
                this.weight[w] = specsD[i];
                if (w==nbOfElt-1){ break; }
                w++;
            }
            if (i%2==1){ //note: odd index = value
                this.value[v] = specsD[i];
                v++;
            }
        }
        System.out.println(Arrays.toString(this.weight));
        System.out.println(Arrays.toString(this.value));

    }


    /**
     * accessors
     */
    public int getCapacity(){
        return this.capacity;
    }

    public double[] getWeight(){
        return this.weight;
    }

    public String printWeight(){
        return Arrays.toString(this.weight);
    }

    public double[] getValue(){
        return this.value;
    }

    public String printValue(){
        return Arrays.toString(this.value);
    }
    /**
     * end accessors
     */


    public double getRatio(int i){
        return this.value[i]/this.weight[i];
    }


    public void sortByRatio(){
        //fixme
    }



    /**
     * test
     */
    public static void main(String[] args) throws FileNotFoundException {


        File file0 = new File("C:\\Users\\...\\src\\com\\company\\sac0.txt");
        Backpack backpack0 = new Backpack(file0);

    }



}