Thread: loop or what

Hi all witing a program and need help where you see<<<<<<<<< I need the program to return to the main menu or when it has done its job in that area i.e enter taxi number enter name then it needs to return to main menu but cant think how woul get a FOR or While loop to do that as you can see the main menu has 4 instances of sub menu and as they are completed it will need to return to main menu. at moment if i enter data in ie taxi number and name program ends which with the code below is right but it needs to loop back from each sub menu

Thanks in advance for help

//This program will provide a menu system for inputting //data regards 3 taxi's import java.util.Scanner;//importing the scanner utility     class c22taxis { public static void main (String[]args) { //initialising the scanner Scanner input = new Scanner(System.in);   //creating/initialising the variables String taxi1, taxi2,taxi3; String [] name = new String[3]; String [] Status = new String [3]; int choice = 0; int tNo = 0; //array variable for changing driver names //i.e. driver 1 would be name[0]     //printing of the system menu on screen to user System.out.println("Welcome to C22 Taxis automated System"); System.out.println("");// blank line System.out.println("Please select from a option below to continue."); System.out.println("");// blank line System.out.println(" 1. Enter/Change Driver Name."); System.out.println("");// blank line System.out.println(" 2. Enter/Change veichle booking status."); System.out.println("");// blank line System.out.println(" 3. Enter/Change veichle service status."); System.out.println("");// blank line System.out.println(" 4. List all veichle status"); System.out.println("");// blank line System.out.println(" 5. Exit");//exit command for program System.out.println(""); System.out.print("Please select a option: "); choice = input.nextInt();   if (choice == 1)// path of input from user { System.out.println('\f'); // sub menu for driver change details System.out.println(" Driver name sub Menu"); System.out.println(""); System.out.println(""); System.out.print("Please enter taxi number: "); tNo = input.nextInt();//instruction for user to input number //if/else relating to choice made in sub menu will then prompt user for tsxi no. and then name //name then goes in relevant array position.   if (tNo == 1) { System.out.print("Please enter drivers name: "); name[0] = input.next(); } else if (tNo ==2) { System.out.print("Please enter drivers name: "); name[1] = input.next(); } else if (tNo ==3) { System.out.print("Please enter drivers name: "); name[2] = input.next(); } //else instruction at end giving invalid input for anything other else System.out.println("Invalid entry please restart");<<<<<<<<<   } else if (choice == 2) System.out.println('\f'); //sub menu start for taxi status System.out.println(" Taxi status sub Menu"); System.out.println(""); System.out.println(""); System.out.print("Please enter taxi number: "); tNo = input.nextInt();//instruction for user to input number //if/else relating to choice made in sub menu will then prompt user for taxi status //status will then go in relevant array position.   if (tNo == 1) { System.out.print("Please enter taxi1 status(if no status enter NONE): "); Status[0] = input.next(); } else if (tNo ==2) { System.out.print("Please enter taxi1 status(if no status enter NONE): "); Status[1] = input.next(); } else if (tNo ==3) { System.out.print("Please enter taxi1 status(if no status enter NONE): "); Status[2] = input.next(); } //else instruction at end giving invalid input for anything other else System.out.println("Invalid entry please restart");<<<<<<<<<<<       } }

Separate the code in the main method into a separate function and call that function from the main method. This structure allows you to call that method whenever you wish to return the main menu. In doing this, you may wish to instantiate the class c22taxis which will allow you to use class variables for things like the Scanner so you don't have to create new ones.

ok changed the program around using methods like you suggested but for some reason it wont loop back round to main menu can anyone see why all it keeps doing is running the sub menu and if i place loop further up it just runs but no window opens

//This program will provide a menu system for inputting //data regards 3 taxi's import java.util.Scanner;//importing the scanner utility   class c22taxis { public static void menu() //This method will be called by the main method later { //printing of the system menu on screen to user System.out.println("Welcome to C22 Taxis automated System"); System.out.println("");// blank line System.out.println("Please select from a option below to continue."); System.out.println("");// blank line System.out.println(" 1. Enter/Change Driver Name."); System.out.println("");// blank line System.out.println(" 2. Enter/Change veichle booking status."); System.out.println("");// blank line System.out.println(" 3. Enter/Change veichle service status."); System.out.println("");// blank line System.out.println(" 4. List all veichle status"); System.out.println("");// blank line System.out.println(" 5. Exit");//exit command for program System.out.println(""); System.out.print("Please select a option: "); } public static void main (String[]args) { //initialising the scanner Scanner input = new Scanner(System.in);   //creating/initialising the variables String taxi1, taxi2,taxi3; String [] name = new String[3];//name array useable upto as many names as required String [] dest = new String [3];//array for destination again as many taxis as required int choice = 0, preference; int tNo = 0;     menu();//calling the method /main menu   preference = input.nextInt();   while (preference !=5) { if (preference == 1)// path of input from user { System.out.println('\f'); // sub menu for driver change details System.out.println(" Driver name sub Menu"); System.out.println(""); System.out.println(""); System.out.print("Please enter taxi number: "); tNo = input.nextInt();//instruction for user to input number //if/else relating to choice made in sub menu will then prompt user for tsxi no. and then name //name then goes in relevant array position.   switch (tNo) { case 1: System.out.print("Please enter drivers name: "); name[0] = input.next(); break; case 2: System.out.print("Please enter drivers name: "); name[1] = input.next(); break;   case 3: System.out.print("Please enter drivers name: "); name[2] = input.next(); break;   //the default default: System.out.print("invalid entry return to menu."); menu(); break;   } }