SO, I have been working on this Java program that is to emulate an ATM.
I am having an issue with the program calling my functions.

The code currently does not run.
The user inputs 1,2, or 3 and the code breaks because I am assuming that the constructor is lost once the mainMenu() function runs.

Currently, Netbeans is stating that it "cannot find symbol" when it attempts to run the following:

myATM.deposit();
myATM.withdraw();
myATM.getBalance();

Here's what I have currently.
I have to have the separate functions for withdraw, deposit, and get balance.
If I move the function code into their respective menuu locations, it runs fine.

But, I have to call the functions.

Also, all of the Calendar stuff at the top is eventually going to be used to calculate interest. I have to get the program working first before I can worry about the interest stuff.

package edu.umsl.mis3806;
import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.lang.*;
import java.util.GregorianCalendar;
/**
 *
 * @author ***** */
public class ATM
{

        private double balance;
        private int firstdate;
        private int seconddate;
        private Calendar date1 = new GregorianCalendar();
        private Calendar date2 = new GregorianCalendar();
        private boolean dateflag = false;
        private double rate; //interest rate
        

        //public void GetInterest()
        //{
        //int datediff = seconddate - firstdate;
        //rate = .05/365
        //double ratetime = Math.pow(1+rate,datediff);
        //balance = balance * ratetime;
        //firstdate = seconddate;
        //}



   public ATM(double beginBalance) throws IOException
   {
        balance = beginBalance;
   }

      

        public static void main (String args[]) throws IOException
    {
                
        ATM myATM = new ATM(100);
        myATM.mainMenu();



    }
       

        public void mainMenu() throws IOException
        {
        float input;
        float amount;
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        NumberFormat nf = NumberFormat.getCurrencyInstance();
        
        System.out.println("Please select from the following: ");
        System.out.println("1 to Make a Deposit: ");
        System.out.println("2 to Make a Withdrawal: ");
        System.out.println("3 to Check Your Balance: ");
        System.out.println("4 to Exit: ");
        System.out.println("Choice: ");
        input = Float.parseFloat(br.readLine());


        if(input == 1)
        {
           myATM.deposit(); //<----broken here
        }
        else if(input == 2)
        {
            myATM.withdraw();  //<------broken here
        }
        else if(input == 3)
        {
            myATM.getBalance(); //<------broken here
        }
        else if(input == 4)
        {
            System.exit(0);//exits program
        }
    }
         public void deposit(float amount) throws IOException
       {
         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
         NumberFormat nf = NumberFormat.getCurrencyInstance();
         System.out.println("Enter the amount you wish to deposit: ");
         amount = Float.parseFloat(br.readLine());
         balance = (balance + amount);  //deposit function
         System.out.println("After your deposit your available funds are: " + (nf.format(balance)));
         mainMenu();
       }
         
        public void withdraw(float amount) throws IOException
       {
         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
         NumberFormat nf = NumberFormat.getCurrencyInstance();
         System.out.println("Enter the amount you wish to withdraw: ");
         amount = Float.parseFloat(br.readLine());
         balance = (balance - amount);  //deposit function
         System.out.println("After your withdrawal your available funds are: " + (nf.format(balance)));
         mainMenu();
       }

       public void getBalance() throws IOException
       {
          NumberFormat currencyFormatter;
          String currencyOut;
          currencyFormatter = NumberFormat.getCurrencyInstance(Locale.US);
          //currencyOut String = balance;
          System.out.println("Your balance is:" + balance);
          mainMenu();
       }

}

You are calling methods on an object inside the other methods that they do not know about. Remove myAtm before each method call and it should work.

Note: the notation you are using is for calling methods on an object from "the outside", like in the main method you could do a myAtm.deposit() call.

It doesn't work if I do that, unfortunately.

Netbeans then throws an error in the same location.

The error is then "method deposit in class cannot be applied to given types. required: float"

And, I fixed it.

Per your recommendation, removed the myATM(s) from in front of the call methods and adjusted the methods.

if(input == 1)
        {
           deposit();
        }
        else if(input == 2)
        {
            withdraw();
        }
        else if(input == 3)
        {
            getBalance();
        }
        else if(input == 4)
        {
            System.exit(0);//exits program
        }
    }
         public void deposit() throws IOException
       {
         float amount;
         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
         NumberFormat nf = NumberFormat.getCurrencyInstance();
         System.out.println("Enter the amount you wish to deposit: ");
         amount = Float.parseFloat(br.readLine());
         balance = (balance + amount);  //deposit function
         System.out.println("After your deposit your available funds are: " + (nf.format(balance)));
         mainMenu();
       }

        public void withdraw() throws IOException
       {
         float amount;
         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
         NumberFormat nf = NumberFormat.getCurrencyInstance();
         System.out.println("Enter the amount you wish to withdraw: ");
         amount = Float.parseFloat(br.readLine());
         balance = (balance - amount);  //deposit function
         System.out.println("After your withdrawal your available funds are: " + (nf.format(balance)));
         mainMenu();
       }

       public void getBalance() throws IOException
       {
          NumberFormat currencyFormatter;
          String currencyOut;
          currencyFormatter = NumberFormat.getCurrencyInstance(Locale.US);
          //currencyOut String = balance;
          System.out.println("Your balance is:" + balance);
          mainMenu();
       }

}

And now it runs. Thank you !

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