Voici mon code

/*
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* and open the template in the editor.
*/

package produit;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;

/**
*
* @author neo
*/
public class GestionProduit {


private int id;
private float coef;
private String nom;
private String description;
private float volume;
private File FileWriter;
private int answer ;

public void create() throws IOException
{
/**int I1;
String N,I;
String D;
float V;
float K;
BufferedReader IN=null;
BufferedReader IN1=null;
BufferedReader IN2=null;
BufferedReader IN3=null;
try {
IN = new BufferedReader(new InputStreamReader(System.in));
IN1 = new BufferedReader(new InputStreamReader(System.in));
IN2 = new BufferedReader(new InputStreamReader(System.in));
IN3= new BufferedReader(new InputStreamReader(System.in));
}catch (Exception e)
{

}


System.out.println("entrer id:");
I=IN.readLine();
I =I.trim();
I1= Integer.parseInt(I);

System.out.println("id="+I);

System.out.println("entrer nom:");
N=IN1.readLine();
System.out.println("nom="+N);

System.out.println("entrer description:");
D=IN2.readLine();
System.out.println("description="+D);

System.out.println("entrer volume:");
V=IN3.read();
System.out.println("volume="+V);

K=(I1*V)/10;
System.out.println("calcul K:"+K);
System.out.println("produit creer");
if(K>0.75)
{
System.out.println("afficher le produit creer");
}
else
{
System.out.println("supprimer le produit creer");
}*/
File file= new File("c:/gestion_java/"+this.getId()+","+this.getAnswer()+".txt");
FileWriter fw =new FileWriter(file);
fw.write(this.getId()+","+this.getNom()+","+this.getAnswer());
}


public void menu() throws IOException
{

System.out.println("Plateforme de gestion de produits ");
System.out.println("Pour creer un produit => 1 ");
System.out.println("Pour update un produit =>2 ");
System.out.println("Pour delete un produit =>3 ");
System.out.println("Pour lister produit =>4 ");

System.out.println("Veuillez entrer un valeur :::: ");

String I ;
BufferedReader IN=null;
try
{
IN = new BufferedReader(new InputStreamReader(System.in));
}catch (Exception e)
{

}
I=IN.readLine();
I =I.trim();
int a = Integer.parseInt(I);

this.setAnswer(a);

switch(answer)
{
case 1 :
System.out.println("****** vous avez decider de creer un produit *****");
this.MenuP(answer);
this.create();
break;
case 2 :
System.out.println("vous avez decider de update un produit");
this.MenuP(answer);
break;
case 3 :
System.out.println("vous avez decider de delete un produit");

break;
case 4 :
System.out.println("vous avez decider de lister les produits");
break;
default :
System.out.println("errt reyefjrfv urrtt t utfib");
}
}


public void MenuP(int aws) throws IOException
{

String N,I;
String D;
float V;

BufferedReader INId=null;
BufferedReader INNom=null;
BufferedReader INDescrption=null;
BufferedReader INVolume=null;
try {
INId = new BufferedReader(new InputStreamReader(System.in));
INNom = new BufferedReader(new InputStreamReader(System.in));
INDescrption = new BufferedReader(new InputStreamReader(System.in));
INVolume= new BufferedReader(new InputStreamReader(System.in));
}
catch (Exception e)
{

}

System.out.println("entrer id:");
I=INId.readLine();
I =I.trim();
int I1= Integer.parseInt(I);
this.setId(I1);

if (aws == 1 || aws == 2)
{

System.out.println("entrer nom:");
N=INNom.readLine();

this.setNom(nom);


}

}

public void setAnswer(int answer){
this.answer = answer;
}

public int getAnswer(){
return this.answer;
}

public void setId(int id){
this.id = id;
}

public int getId(){
return this.id;
}

public void setNom(String nm){
this.nom = nm;
}

public String getNom(){
return this.nom;
}

}