Concaténer des fichiers

A 1 16258135 16258139 22 16258135 13 
A 1 16258135 16258139 22 16258136 13 
A 1 16258135 16258139 22 16258137 13 
A 1 16258135 16258139 22 16258138 13 
A 1 16258135 16258139 22 16258139 13 
A 2 16258140 16258145 22 16258140 12 
A 2 16258140 16258145 22 16258141 12 
A 2 16258140 16258145 22 16258142 12 
A 2 16258140 16258145 22 16258143 12 
A 2 16258140 16258145 22 16258144 13 
A 2 16258140 16258145 22 16258145 16 

import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.util.LinkedList; 
import java.util.Scanner; 

class A 
{ 
    final String lettre; 
    final int num; 
    final long debut, fin; 
     
    public A(String s) { 
        String[] tab = s.split("\\s+"); 
        lettre=tab[0]; 
        num = Integer.parseInt(tab[1]); 
        debut=Long.parseLong(tab[2]); 
        fin=Long.parseLong(tab[3]); 
    } 
     
    public static LinkedList<A> lire(String fileName) throws FileNotFoundException { 
        LinkedList<A> liste = new LinkedList<A>(); 
        Scanner sc = new Scanner(new File(fileName)); 
        while (sc.hasNextLine()) 
            liste.add(new A(sc.nextLine())); 
        sc.close(); 
        return liste; 
    } 
     
    public String toString() { 
        return lettre+" "+num+" "+debut+" "+fin; 
    } 
} 

class B 
{ 
    final int num1, num2; 
    final long val; 
     
    public B(String s) { 
        String[] tab = s.split("\\s+"); 
        num1 = Integer.parseInt(tab[0]); 
        val=Long.parseLong(tab[1]); 
        num2=Integer.parseInt(tab[2]); 
    } 
     
    public static LinkedList<B> lire(String fileName) throws FileNotFoundException { 
        LinkedList<B> liste = new LinkedList<B>(); 
        Scanner sc = new Scanner(new File(fileName)); 
        while (sc.hasNextLine()) 
            liste.add(new B(sc.nextLine())); 
        sc.close(); 
        return liste; 
    } 
     
    public String toString() { 
        return num1+" "+val+" "+num2; 
    } 
} 

class AB 
{ 
    private static final String endl = System.getProperty("line.separator"); 
     
    public static boolean accept(A a,B b) { 
        return b.val>=a.debut && b.val<=a.fin; 
    } 
     
    public static String toString(A a, B b) { 
        return a+" "+b+endl; 
    } 
     
    public static int fusionner(String fileNameA, String fileNameB, String fileNameAB) throws IOException { 
        LinkedList<A> listeA = A.lire(fileNameA); 
        LinkedList<B> listeB = B.lire(fileNameB);         
        FileOutputStream fic = new FileOutputStream(fileNameAB);         
        int n=0; 
        for (A a : listeA) 
        for (B b : listeB) 
            if (accept(a,b)) 
            { 
                fic.write(toString(a,b).getBytes()); 
                n++; 
            }         
        fic.close(); 
        return n; 
    } 
} 

public class Test 
{ 
    public static void main(String...args) throws IOException { 
        int n = AB.fusionner("D:\\A.txt","D:\\B.txt","D:\\C.txt"); 
        System.out.println(n+" correspondances."); 
    } 
}