So basically, the program is a "sales tracker" and we must enter an id, but the id must be only 8 characters long and if it isn't 8 characters long then the program will tell the user so. I've got most of the program done but I cannot seem to get this part of the program done.
The user can also change the id in the database and the id still must be 8 characters long.
This is the full program
import java.util.*;
public class CreateSalesperson
{
public static void main(String[] args)
{
Salesperson[] salespeople = new Salesperson[20];
int x;
int id;
int count = 0;
String name;
double sales;
final int QUIT = 999;
char option;
String message = "";
Scanner input = new Scanner(System.in);
System.out.print("Do you want to (A)dd, or (C)hange a record or (Q)uit >> ");
option = input.nextLine().charAt(0);
while(option != 'Q')
{
if(option == 'A')
count = addOption(salespeople, count);
else
if(option == 'C')
changeOption(salespeople, count);
else
System.out.println("Invalid entry");
System.out.print("Do you want to (A)dd, or (C)hange a record or (Q)uit >> ");
option = input.nextLine().charAt(0);
}
}
public static int addOption(Salesperson[] array, int count)
{
Scanner input = new Scanner(System.in);
int id;
double sales;
String name;
boolean alreadyEntered;
if(count == array.length)
System.out.println("Sorry - array is full -- cannot add a record");
else
{
System.out.print("Enter name of salesperson >> ");
name = input.nextLine();
while(id.length() != 8)
{
System.out.print("Enter salesperson ID >> ");
id = input.nextInt();
}
alreadyEntered = false;
for(int x = 0; x < count; x)
if(array[x].getId() == id)
{
System.out.println("Sorry -- ID number already exists");
alreadyEntered = true;
}
if(!alreadyEntered)
{
System.out.print("Enter sales amount >> ");
sales = input.nextDouble();
array[count] = new Salesperson(id, sales, name);
count;
}
}
display(array, count);
input.nextLine();
return count;
}
public static void changeOption(Salesperson[] array, int count)
{
Scanner keyboard = new Scanner(System.in);
int position = 0;
int id;
double sales;
if(count == 0)
System.out.println("Database is empty -- cannot change record");
else
{
System.out.print("Enter ID to change >> ");
id = keyboard.nextInt();
boolean exists = false;
for(int x = 0; x < count; x)
if(array[x].getId() == id)
{
exists = true;
position = x;
}
if(!exists)
System.out.println("Sorry - ID number #" id " does not exists in the database");
else
{
System.out.print("Enter sales >> ");
sales = keyboard.nextDouble();
array[position].setSales(sales);
}
keyboard.nextLine();
display(array, count);
}
}
public static void display(Salesperson[] array, int count)
{
int a,b;
Salesperson temp;
int highSubscript = count - 1;
for(a = 0; a < highSubscript; a)
for(b = 0; b < highSubscript; b)
{
if(array[b].getId() != array[b 1].getId())
{
temp = array[b];
array[b] = array[b 1];
array[b 1] = temp;
}
}
System.out.println("\nCurrent database:");
for(a = 0; a < count; a)
System.out.println("NAME: " array[a].getName() " ID: #" array[a].getId() " Sales Amount: $" array[a].getSales());
System.out.println();
}
}
I've tried to do a while loop with id.length != 8, but I keep getting an int cannot be dereferenced error. How can I fix this? Can I fix this? If not, what can I do to make this correct.
while(id.length() != 8)
{
System.out.print("Enter salesperson ID >> ");
id = input.nextInt();
}
alreadyEntered = false;
CodePudding user response：
If the ID is Alphanumeric where is can be a mix of alpha and numeric characters then you can just use Scanner#nextLine() method instead of the Scanner#nextInt() method, for example:
String id = "";
while (id.isEmpty()) {
System.out.print("Enter salesperson ID >> ");
id = input.nextLine().trim();
// Input Validation:
if (id.length() < 8) {
System.out.println("Invalid ID Supplied (" id ")! ID must be 8 characters long!");
id = "";
}
}
// If we made it to here then the entry was good.
System.out.println("The Salesman ID is: -> " id);
If however, the Salesman ID is suppose to be an integer value entry then you can use the same code but the validation section would need to change, for example:
String id = "";
while (id.isEmpty()) {
System.out.print("Enter salesperson ID >> ");
id = input.nextLine().trim();
/* Input Validation: Is the ID 8 characters long and
are all characters numerical digits? */
if (id.length() < 8 || !id.matches("\\d ")) {
System.out.println("Invalid ID Supplied (" id ")! ID must be 8 Digits in length!");
id = "";
}
}
// If we made it to here then the entry was good.
// Convert the id string to an integer value
int salesmanID = Integer.parseInt(id);
System.out.println("The Salesman ID is: -> " salesmanID);
CodePudding user response：
As "id" is int and it must be 8 digits, try changing while(id.length() != 8) to while(!(id >= 10000000 and id <= 99999999)
10000000 is smallest 8 digit number 99999999 is largest 8 digit number