For some reason i'm loosing access to my variables inside the switch statement,
I am not allowed to use any global variables.
import java.util.Scanner;
public class Projet {
public static void main(String[] args) {
String clef="vide";
Scanner in = new Scanner(System.in);
showMenu(in);
in.close();
}
Main method is kept as clean as possible ... calling the menu just once.
public static void showMenu(Scanner in){
System.out.printf("******************************************%n" +
"* Choisissez une des options suivantes : *%n" +
"* 1) Saisir la clef secrète *%n" +
"* 2) Afficher la clef secrète *%n" +
"*******************************************%n%n%n");
choice(in);
}
showMenu(in) Depending on the choice made we would get into a specific case.
public static int getNumber(Scanner in){
int choice = in.nextInt();
in.nextLine();
return choice;
}
getNumber(in) returning our previous input so we can get into the case. Double function, will be removed in next version.
public static void choice(Scanner in){
try {
switch(getNumber(in)){
Case 1 ->
We are supose to keep the clef variable which is returned by saisirClef(in)
case 1:
String clef = saisirClef(in);
break;
Case 2 -> It should have kept the value from case 1 ?
case 2:
afficherClef();
break;
default:
System.out.println("Default");
break;
}
} catch (Exception e) {
System.out.println("Please enter a number");
//choice(in);
}
}
saisirClef(in) method called in case one.
public static String saisirClef(Scanner in){
System.out.println("Saisir la clef secrète :");
String a = in.nextLine();
System.out.println("Voici ce que vous avez tapper : "+a);
return a;
}
afficherClef method called in case 2
public static String afficherClef() {
return clef;
}
}
Every time showMenu(in) my variables get cleared.
I should be able to transport the clef variable from case to case ...
Could you please help me figure out what am I doing wrong here ?
I am using return statements, I just don't understand why they disappears.
I'm not sure what you are trying to achieve. There are multiple compilation and logical error in your code. I have tried to correct them as per my understanding and posting the code (since it is too large to post as comment) with comments where I made changes. Hope this helps you.
public class Project {
/**
* @param args
* @param Scanner
*/
public static void main(String[] args) {
String clef = "vide";
Scanner in = new Scanner(System.in);
showMenu(in,clef);// passed clef as a parameter - The New Idiot
in.close();
}
/**
* added an extra parameter
* @param clef
* @modified The New Idiot
*/
public static void showMenu(Scanner in,String clef) {
System.out.printf("******************************************%n"
+ "* Choisissez une des options suivantes : *%n"
+ "* 1) Saisir la clef secrète *%n"
+ "* 2) Afficher la clef secrète *%n"
+ "* 3) Chiffrer un fichier *%n"
+ "* 4) Déchiffrer un fichier *%n"
+ "* 5) Quitter *%n"
+ "******************************************%n%n%n");
// passed clef as a parameter - The New Idiot
choice(in,clef);
}
public static int getNumber(Scanner in) {
int choice = in.nextInt();
in.nextLine();
return choice;
}
/**
* added an extra parameter
* @param clef
* @modified The New Idiot
*/
public static void choice(Scanner in,String clef) {
try {
switch (getNumber(in)) {
case 1:
// removed duplicate variable declaration - @modified The New Idiot
clef = saisirClef(in);
resetMenu(clef, in);
// passed clef as param - @modified The New Idiot
showMenu(in,clef);
break;
case 2:
//String should be compared with equals() method - @modified The New Idiot
if (clef.equals("vide")) {
System.out.println("Erreur : Aucune clef n’a été saisie.");
// passed clef as param -@modified The New Idiot
showMenu(in,clef);
} else {
System.out.println("La clef secrète est :" + clef);
}
break;
case 3:
chiffrerFichier();
break;
case 4:
dechiffrerFichier();
break;
case 5:
quitApplication();
break;
default:
System.out.println("Default");
break;
}
} catch (Exception e) {
System.out.println("Please enter a number");
// choice(in);
}
}
/**
* Commented this method, as it does nothing
* @return
* @modified The New Idiot
*/
/*public static String afficherClef() {
return clef;
}*/
public static boolean isKeyLength(String a) {
boolean flag = true;
if (a.length() < 4) {
System.out.println("Erreur : Le mot est trop petit");
flag = false;
}
return flag;
}
public static String validateKey(String a) {
// declared a local variable flag
// it will be true only if sKeyLength(a) and isKeyChar(a) are true
// @modified The New Idiot
boolean flag = isKeyLength(a) && isKeyChar(a);
if (flag) {
String clef = a;
System.out.println(clef);
return clef;
} else {
String clef = "showMenu";
return clef;
}
}
public static boolean isKeyChar(String a) {
boolean flag = true;
for (int i = 0; i <= a.length() - 1; i++) {
// Verifie Majuscule
if ((int) a.charAt(i) >= 65 && (int) a.charAt(i) <= 90) {
System.out.println("Au moins une des lettre est en Majuscule");
// Continue Program
} else {
System.out
.println("Erreur : Au moins un caractère est invalide ");
flag = false;
}
// Verifie Doublons
if (i == a.length() - 1) {
if (a.charAt(i) == a.charAt(i - 1)) {
System.out
.println("Erreur : Il existe au moins un doublon.");
System.out.println("Dernier iteration");
// Restart Program
flag = false;
} else {
// Continue Program
System.out.println("No doubles found");
System.out.println("Dernier iteration");
}
} else {
if (a.charAt(i) == a.charAt(i + 1)) {
System.out
.println("Erreur : Il existe au moins un doublon.");
System.out.println("Iteration :" + i);
// Restart Program
flag = false;
} else {
// Continue Program
System.out.println("No doubles found");
}
}
}
return flag;
}
public static String saisirClef(Scanner in) {
System.out.println("Saisir la clef secrète :");
String a = in.nextLine();
System.out.println("Voici ce que vous avez tapper : " + a);
return validateKey(a);
}
public static void resetMenu(String clef, Scanner in) {
if (clef == "showMenu") {
saisirClef(in);
} else {
System.out.println("Clef saisie avec succes");
}
}
public static void chiffrerFichier() {
System.out.println("Chiffrer un fichier :");
}
public static void dechiffrerFichier() {
System.out.println("Déchiffrer un fichier :");
}
public static void quitApplication() {
System.out.println("Quitter :");
}
}
