Bringing Classes Together

Question

Hi I've been working on a calculator that now writes to file, and can activated from a main menu. I got the two to work together by extending the main menu to the calculator and simply running the method where it was needed.
Then I wanted to veiw the file. So I put together a program that would read and display the text when run, But I mentioned earlier that I extended the Calculator to the MainMenu to get them to work together, now how am supposed to extend the FileReader as well?
I have three classes:
A main Menu class. - asks user to input 1 for calculator, or 2 to veiw file. So if(input==1); run the method, which is inside the calculator class.
if(input==2); I want to view the file.
I have a lonely FileReader class, I've tried extending the MainMenu to it, but that hasn't worked. So I need help with using the method that's inside the FileReader class, in my MainMenu class.
This might be an easy one... too easy? Any help would really be appriecated. I can post the code for any or all of the classes if it helps.

Answer 1

This is the code for the main menu. Before I introduced the second option (view file), the classes worked together without problems.
it was originally:
class Menu_RunThis extends CalcSalesTax {I extended the CalcSalesTax class so that I could use the method in CalcSalesTax "salesTax()"
But now that I have another class with a method in it which I would like to use, how do I use it?
(See method getContents)
This is the broken code... of the MainMenu*:*
import java.io.*;
import java.util.*;
class Menu_RunThis    {
public static ReadLog getContents = new getContents;
public static CalcSakesTax salesTax = new salesTax;
public static void main(String[] args)throws java.io.IOException {
System.out.println("Instructions:");
System.out.println("**************");
System.out.println("Press '1' to calculate sales tax, specify the number of items you intend to\r\ncalculate, and their prices. This calculator assumes that sales tax is equal to 6.5 %.\r\nThe information you provide/recieve is stored in a text-file for your convience.");
System.out.println("");
System.out.println("Please Select:");
System.out.println("1: to Calculate Tax");
System.out.println("2: view Log File");
System.out.println("or");
System.out.println("0: to Exit");
int val = 3;
while (val != 0)
Scanner input = new Scanner(System.in);
val = input.nextInt();
if (val == 0) return;
else if (val == 1) salesTax(); //SalesTax method is called
else if (val == 2) subMenu();
else {System.out.println("Please Select:");
System.out.println("1: to Calculate Tax");
System.out.println("or");
System.out.println("0: to Exit");}}
public static void subMenu(){
System.out.println("Please Select:");
System.out.println("1: To view the Log file");
System.out.println("or");
System.out.println("0: to Exit");
int val = 3;
while (val != 0)
Scanner input = new Scanner(System.in);
val = input.nextInt();
if (val == 0) return;
else if (val == 1) getContents(); //getContents method is called
else {
System.out.println("Please Select:");
System.out.println("1: To view the Log file");
System.out.println("or");
System.out.println("0: to Exit");
}}Edited by: tark_theshark on Nov 26, 2007 10:58 PM