We are building a bank program, but the professor only gave us a small powerpoin

Question

We are building a bank program, but the professor only gave us a small powerpoint, and i have been unable to learn it online. Specifically i need help with the Delete Account method right now, as i have Add method working and i can work on the other stuff later. This program just takes an array and adds or deletes to the text file im pretty sure. Thanks in advance for any help!

import java.io.*;
import java.util.*;
import javax.swing.JOptionPane;

public class Richard1155318
{
   String acctName;
   int acctNum, acctBal;
   private ArrayList<Accounts> bankAccounts = new ArrayList<Accounts>();
  
   //CHECK account balance
   public void balance()
   {

   }
  
   //DEPOSIT money
   public void deposit()
   {
      
   }
  
   //WITHDRAW money
   public void withdraw()
   {
      
   }
  
   //ADD a new account
   public void add()
   {
       //Gather Info
       acctName = JOptionPane.showInputDialog("Please enter the name for the account:");
       acctNum = Integer.parseInt(JOptionPane.showInputDialog("Please enter the number for the account:"));
       acctBal = Integer.parseInt(JOptionPane.showInputDialog("Please enter the initial deposit for the account:"));
      
       //Append to file
       try
       {
           FileWriter fw = new FileWriter("bank.txt", true);
           BufferedWriter bw = new BufferedWriter(fw);
          
           bw.write(acctName + "," + acctNum + "," + acctBal + " ");
           bw.close();

           JOptionPane.showMessageDialog(null, "Account has been added.", "Success!", JOptionPane.PLAIN_MESSAGE);
       }
       catch(IOException ioe)
       {
           ioe.printStackTrace();
       }
   }
  
   //DELETE account
   public void delete()
   {
       //Gather account# to be deleted
       acctNum = Integer.parseInt(JOptionPane.showInputDialog("Please enter your account#:"));

       if(acct found)
       {
           //Rewrite file
           try
           {
               FileWriter fw = new FileWriter("bank.txt", false);
               BufferedWriter bw = new BufferedWriter(fw);

               for (Accounts rewriteFile : bankAccounts)
               {
                   bw.write(rewriteFile.getName() + "," + rewriteFile.getNum() + "," + rewriteFile.getBal() + " ");
                   System.out.println(rewriteFile);
               }
               bw.close();

               JOptionPane.showMessageDialog(null, "Your account has been deleted.", "Success!", JOptionPane.PLAIN_MESSAG);
           }
           catch(IOException ioe)
           {
               ioe.printStackTrace();
           }
       )
       else
       {
           JOptionPane.showMessageDialog(null, "Account not found.", "ERROR", JOptionPane.ERROR_MESSAGE);
       }
   }

   public static void main (String[] args)
   {
       boolean var = false;
       String choice;
  
       do
       {
           Richard1155318 account = new Richard1155318();
          
           //Choose transaction type
           choice = JOptionPane.showInputDialog("Please choose an option: 1. Check Balance 2. Deposit 3. Withdraw 4. Add Account 5. Delete Account #. Quit");
          
           if(choice.equals("1"))
           {
               account.balance();
           }
          
           else if(choice.equals("2"))
           {
               account.deposit();
           }
          
           else if(choice.equals("3"))
           {
               account.withdraw();
           }
          
           else if(choice.equals("4"))
           {
               account.add();
           }
          
           else if(choice.equals("5"))
           {
               account.delete();
           }
          
           else if(choice.equals("#"))
           {
               var = true;
               JOptionPane.showMessageDialog(null, "Have a nice day!", "Thank You", JOptionPane.PLAIN_MESSAGE);
           }
          
           else
           {
               JOptionPane.showMessageDialog(null, "There was an error, please try again.", "Error", JOptionPane.ERROR_MESSAGE);
           }
       } while(var == false);
   }
}

Explanation / Answer

hi, I have written your delete method. You can replace your delete method with this

public void delete()
    {
        //Gather account# to be deleted
        acctNum = Integer.parseInt(JOptionPane.showInputDialog("Please enter your account#:")); //Rewrite file
        try
            {  
               // declaring input output files
               File inputFile = new File("bank.txt");
               File tempFile = new File("myTempFile.txt");
               BufferedReader reader = new BufferedReader(new FileReader());
               BufferedWriter writer = new BufferedWriter(new FileWriter(tempFile));

               String lineToRemove = String.valueOf(acctNum); // converting account into String
               String currentLine;
               boolean flag = false; // to check account was in file or not
               while((currentLine = reader.readLine()) != null) {
                   // trim newline when comparing with lineToRemove
                   String trimmedLine = currentLine.trim();
                   if(trimmedLine.contains(lineToRemove)) {// if current line contains account to be deleted
                       continue;                           // then do not write to temp file
                       flag = true ;
                   }
                                                                  
                   writer.write(currentLine);
               }
               writer.close();
               reader.close();
               boolean successful = tempFile.renameTo(inputFile); // renaming temp file to "bank.txt"
               if(flag == false){// did not found account
                   JOptionPane.showMessageDialog(null, "Account not found.", "ERROR", JOptionPane.ERROR_MESSAGE);
               }else // acount found
                   JOptionPane.showMessageDialog(null, "Your account has been deleted.", "Success!", JOptionPane.PLAIN_MESSAG);
            }
            catch(IOException ioe)
            {
                ioe.printStackTrace();
            }
    }

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