尝试调用另一个类中的方法以在 IF 语句中使用

Question

I am trying to call a class when running an IF statement which will ask the user if they want to view the program in English or Spanish. The Spanish Code is in a different class and I want to call is so when/if the user chooses to view the program in Spanish and disregards the English code written below.

Error: Java cannot find symbol
symbol: method Spanish()
location: variable span of type source.Spanish

Below is my second class(that I want to call):

package source;

import java.util.Scanner;
import java.lang.String;

public class Spanish {
    public Spanish() {}
}

And below is how I am trying to call in my main class:

if (language.equals("Span")) {
    source.Spanish span = new source.Spanish();
    span.Spanish();
}
else {
   //More code.
}

My first time asking a question so I am sorry if the format isn't right or if the question has already been answered, I looked at a few of the past questions but no luck so far. Thank you :)

---

EDIT

package source;

import java.util.Scanner;
import java.lang.String;

public class CashRegister {
public static void main(String[] args) {

   String registerfloat;
   String input;
   String name;
   String anotherTransaction;
   String item2;
   String choice;
   String language = "";
   double balance;
   double cost;
   double change = 0;
   double cash = 0;
   double amountRequired = 0;
   double totalAmount = 0;

   Scanner in = new Scanner(System.in);

   System.out.println("Hello! Welcome to the Cash Register.\n");

   while (true) {
       if (language.equals("Eng"))break;
       if (language.equals("Span"))break;

       else {
           System.out.println("Which language would you like to use? English (Eng) or Spanish (Span)?:");
           language = in.nextLine();
       }
   }

   if(language.equals("Span")) {
       source.Spanish span = new source.Spanish();
       span.Spanish();
   }
   else {

       System.out.print("Please enter cash register's float: $");
       registerfloat = in.nextLine();
       balance = Double.parseDouble(registerfloat);


       boolean loop = true;
       while (loop == true) {
           System.out.println("Do you wish to continue this transaction?: (Yes/No)");
           choice = in.nextLine();
           loop = false;
           switch (choice) {
               case "Yes":

                   System.out.print("Please enter the item's name:\n");
                   input = in.nextLine();
                   name = input;

                   System.out.print("Please enter the item's cost:");
                   input = in.nextLine();
                   cost = Double.parseDouble(input);


                   System.out.println("Do you wish to add another item?: Yes/No");
                   item2 = in.nextLine();

                   while (true) {
                       if (item2.equals("No"))
                           break;
                       else {
                           System.out.print("Please enter the item's name:\n");
                           input = in.nextLine();
                           name = input;

                           System.out.print("Please enter the item's cost:");
                           input = in.nextLine();
                           cost = Double.parseDouble(input);

                           System.out.println("Do you wish to add another item?: Yes/No");
                           item2 = in.nextLine();

                       }
                   }

                   Transaction trans = new Transaction(name, cost);

                   amountRequired = amountRequired + trans.getCost();
                   totalAmount = totalAmount + trans.getCost();

                   System.out.print("Please enter the cash amount tendered: $");
                   input = in.nextLine();
                   cash = cash + Double.parseDouble(input);
                   amountRequired = amountRequired - cash;

                   balance = balance + cash;
                   change = cash - totalAmount;

                   System.out.println("Amount of change required = " + change);
                   loop = true;
                   break;
               case "No":
                   balance = balance - change;
                   System.out.print("Balance of the Cash Register: $" + balance + "\n");

                   System.out.println("\nThank you for using the Cash Register!");

                   System.exit(0);
               default:
                   loop = true;
                   System.out.println("Wrong input, try again!");
                   break;
           }
       }
   }

} }

Above is my entire code from CashRegister. "Spanish" has the EXACT same code except the print statements are in Spanish rather than English. Also, sorry if its hard to read or there is unnecessary stuff in there, its a group assignment and in early stages so is a bit of a mess. Cheers

Update 2

package source;

import java.util.Scanner;

public class RunClass {
public static void main(String[] args) {

    String registerfloat;
    String language = " ";
    double balance;

    Scanner in = new Scanner(System.in);

    System.out.println("Hello! Welcome to the Cash Register.\n");

    System.out.print("Please enter cash register's float: $");
    registerfloat = in.nextLine();
    balance = Double.parseDouble(registerfloat);

    while (true) {
        if (language.equals("Eng")) break;
        if (language.equals("Span")) break;

        else {
            System.out.println("Which language would you like to use? English (Eng) or Spanish (Span)?:");
            language = in.nextLine();
        }
    }

    if (language.equals("Eng")) {
        source.CashRegister.CashRegister();
    }
    else {
        // trying to enter Spanish.register here but it does not even show as its not on the current branch.
    }

}

}

Answer 1

In your Spanish class you have

public class Spanish {
    public Spanish() {}
}

but public Spanish() is not an ordinary method, it's a constructor that only can be called with the keyword new which you already do.

if (language.equals("Span")) {
    Spanish span = new Spanish();
    span.Spanish();
}

(I removed the package name since it isn't needed) So you need another method in your Spanish class that does the actual work.

The main problem though, apart from the fact that you have duplicated all the code, is that you are trying to do everything in the main() method of CashRegister

I would, for a start, create a simple starting class, lets call it Starter that ask the language question and then lets the CashRegister or Spanish class handle the main functionality.

class Starter {
    public static void main(String[] args) {
        //Ask question about language as before

        if (language.equals("Span")) {
            Spanish.register();
        } else {
            CashRegister.register();
        }
    }
}

And then you implement a register method in both CashRegister and Spanish that contain the code after else , note that I made the method static

public class CashRegister {
    public static void register() {
        System.out.print("Please enter cash register's float: $");
        registerfloat = in.nextLine();
        balance = Double.parseDouble(registerfloat);
        //... rest of code
    }
}

This should get you started but there are many further improvements that can be done.

---

If you don't want to have a static method the Starter class needs to be modified as below but I think a static method makes more sense.

 if (language.equals("Span")) {
     Spanish spanish = new Spanish();
     spanish.register();
 } else {
     CashRegister cashRegister = new CashRegister();
     cashRegister.register();
 }