Banking System Project With File Handling in Java

This is the small banking system project for beginner programmers. The project fulfills all the basic function of banking system like creates account, deposit, withdraw and check balance. The program performs all the functions with file handling and save the records in text files.

Source Code

package LEP.uzair.bms.bank;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Date;
import java.util.Scanner;
 public class Transaction {
    private String transactionType;
    private double amount;
    private long accountNum;
    private Date date;
    Scanner sc = new Scanner(System.in);
    public Transaction() {
    }
    public void transaction(long accountNum, String            transactionType,double amount) {
        this.accountNum= accountNum;
        this.transactionType = transactionType;
        this.amount = amount;
        date = new Date();
        operation();
    }
        private void operation() {
     if (transactionType.equalsIgnoreCase("Opening")) {
    try{
              // Create file
              FileWriter fstream = new FileWriter("MyFile.txt", true);
              BufferedWriter out =newBufferedWriter(fstream);
              int userId=(int) (findMaxId()+1);
              out.write(Integer.toString(userId)+"\n");
              out.write(amount+"\n");
              out.write(date+"\n");
              //Close the output stream
              out.close();
             }catch (IOException e) {
                 System.err.println("Caught IOException: " + e.getMessage());
             }
           }

        else if (transactionType.equalsIgnoreCase("withdraw")) {
         Path path = Paths.get("MyFile.txt");
   if (Files.exists(path)) {
    findUpdate() ;
   }else{
    System.out.println("File not Found");
   }
        }

        else if (transactionType.equalsIgnoreCase("deposit")) {
         Path path = Paths.get("MyFile.txt");
   if (Files.exists(path)) {
    findUpdate() ;
   }else{
    System.out.println("File not Found");
   }
        }

        else if (transactionType.equalsIgnoreCase("showInfo")) {
         Path path = Paths.get("MyFile.txt");
   if (Files.exists(path)) {
          findDisplay();
         }else{
    System.out.println("File not Found");
   }
        }

        else {
            System.out.println("Invalid option");
            return;
        }

    }
 private int findMaxId() {
  try{
   BufferedReader reader = new BufferedReader(new FileReader("MyFile.txt"));
   int count=0;
   while ((reader.readLine()) != null)
   {
    count=count+1;
   }
   reader.close();
   // Logic for finding maximum Id
   return count/3;
  }
  catch (Exception e)
  {
   System.err.format("Exception occurred trying to read '%s'.", "MyFile.txt");
   e.printStackTrace();
  }
  return 0;
 }

 private void findDisplay() {
  try{
   BufferedReader reader = new BufferedReader(new FileReader("MyFile.txt"));
   String line;
   String trmpaccountNum=Long.toString(accountNum);
   int count=1;
   while ((line = reader.readLine()) != null)
   {
    //my logic for displaying 2 more lines after found
    if(count>1){
              trmpaccountNum =line;
             }
     if((line.equals(trmpaccountNum))&&(count<4)){
      System.out.println(line);
      count=count+1;
       }
      }
   reader.close();
  }
  catch (Exception e)
  {
   System.err.format("Exception occurred trying to read '%s'.", "MyFile.txt");
   e.printStackTrace();
  }
 }
 private void findUpdate() {
  try{
   BufferedReader reader = new BufferedReader(new FileReader("MyFile.txt"));
  
   FileWriter fstream = new FileWriter("TempFile.txt", true);
            BufferedWriter out =newBufferedWriter(fstream);
  
            String line;
   String trmpaccountNum=Long.toString(accountNum);
   int count=1;
   while ((line = reader.readLine()) != null)
   {
   
    //my logic for updating 3 lines after found
    if(count>1){
              trmpaccountNum =line;
             }
     if((line.equals(trmpaccountNum))&&(count<4)){
      double temp_amount = 0;
      if (count==1){
       out.write(accountNum+"\n");
      }
      else if (count==2){
       if(transactionType.equalsIgnoreCase("withdraw")){
        temp_amount=Double.parseDouble(line)-amount;
       }else if(transactionType.equalsIgnoreCase("deposit")){
        temp_amount=amount+Double.parseDouble(line);
       }
       if(temp_amount<0){
        System.out.println("Could not update \n");
        out.write(Double.toString(amount)+"\n");
       }else{
        System.out.println(Double.toString(temp_amount)+" is updated value\n");
        out.write(Double.toString(temp_amount)+"\n");
       }
      }
      else if(count==3){
       out.write(date+"\n");
      }
       count=count+1;
                    }else{
                      out.write(line+"\n");//System.out.println("Account not found in file");
                    }
          }
   out.close();
   reader.close();
  // Rename the temporary file and delete original file
    File f1 = new File("MyFile.txt");
    f1.delete();
    File f2 = new File("TempFile.txt");
    boolean b = f2.renameTo(f1);
    if(b){
    }else{
     System.out.println("Updated has Error");
    }
   // Rename the temporary file and delete original file
  }
  catch (Exception e)
  {
   System.err.format("Exception occurred trying to read '%s'.", "MyFile.txt");
   e.printStackTrace();
  }
 }
}

//Start.Java
 package LEP.uzair.bms.main;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import LEP.uzair.bms.bank.Transaction;

public class Start {
  int count=0;
  List<String> FileRecords;
  public void StartBank(){
  @SuppressWarnings("resource")
  Scanner input = new Scanner(System.in);
  char mainYesOrNo = 'Y';
  while (mainYesOrNo =='Y'){
   System.out.print("\t\t     ================================\n");
   System.out.print("\t\t     Welcome To Bank Managment System  \n");
   if(count<1){
    count=count+1;
   }else{
    System.out.print("\t\t                    Again        \n");
   }
   System.out.print("\t\t     ================================\n");
  
   System.out.print("\tQ:What do you want to do?\n\n");
   if(count<2){
    System.out.print("\t\t1 : Start\n\n");
    count=count+1;
   }else{
    System.out.print("\t\t1 : Start Again\n\n");
   }
   System.out.print("\t\t2 : Exit\n\n");
   System.out.println("\t\t\tYou Select : ");
   int switchChoice = input.nextInt();
   switch (switchChoice)
   {
  
    case 1: {
     start();
     break;
    }
    case 2: {
     return;
    }
    default: {
      System.out.println("Invalid Selection");
      error();
       break;
    }
   }
   System.out.println("\n\tDo u want to run your Program Again \n\t\t\tY = yes\n\t\t\tN = No\n");
   System.out.println("You Select : ");
  
   mainYesOrNo =(input.next()).charAt(0);
   if(Character.isLowerCase(mainYesOrNo )){
    mainYesOrNo =Character.toUpperCase(mainYesOrNo );
   }//End If
  }//End While
 }
 private List<String> readFile(String filename) {
  List<String> records = new ArrayList<String>();
    try
    {
      BufferedReader reader = new BufferedReader(new FileReader(filename));
      String line;
      while ((line = reader.readLine()) != null)
      {
        records.add(line);
      }
      reader.close();
      return records;
    }
    catch (Exception e)
    {
      System.err.format("Exception occurred trying to read '%s'.", filename);
      e.printStackTrace();
      return null;
    }
 }
 private void start() {
  String choice, ch, operation;
        Transaction transac = new Transaction();
        Scanner sc = new Scanner(System.in);
        double amount;
        long accountNo=0;

        do {
        
         System.out.print("\tQ:What do you want to do next?\n\n");
   System.out.print("\t\t1 : New account\n\n");
   System.out.print("\t\t2 : Transaction\n\n");
   System.out.print("\t\t3 : View Account Information\n\n");
   System.out.print("\t\tq : Exit\n\n");
            System.out.println("Your choice: ");
            choice = sc.next();
            switch (choice) {
            case "1":
                double openingBalance;
                System.out.println("Enter the opening balance :");
                openingBalance = sc.nextDouble();
                transac.transaction(accountNo, "Opening", openingBalance);
                accountNo=accountNo+1;
                break;
            case "2":
             System.out.print("\tQ:What do you want to do for Transaction?\n\n");
             System.out.print("\t\ta : Deposit\n\n");
             System.out.print("\t\tb : Withdraw\n\n");
                ch = sc.next();
                if (ch.equalsIgnoreCase("a"))
                    operation = "Deposit";
                else if (ch.equalsIgnoreCase("b"))
                    operation = "Withdraw";
                else {
                    operation = "Invalid option";
                }
                System.out.println("Account Number:");
                accountNo = sc.nextLong();
                System.out.println("Amount:");
                amount = sc.nextDouble();
                transac.transaction(accountNo, operation, amount);
                break;
            case "3":
            
             System.out.println("Account Number:");
                accountNo = sc.nextLong();
                operation = "showInfo";
                transac.transaction(accountNo, operation, 0);
                break;
            case "q":
                System.out.println("Thank you!");
                return;
            default:
                error();
            }
        } while (choice != "q");
        sc.close();
 }
 public static void error() {
  System.out.print("\t\t     *****************************\n");
  System.out.print("\t\t     |-----------> ERROR <--------| \n");
  System.out.print("\t\t     *****************************\n");
  System.out.print("\t\t     You Select some thin wrong\n");
  System.out.print("\t\t                OR\n");
  System.out.print("\t\t  There may be some othere Problem\n");
  System.out.print("\t\t It is better for you to try again...!\n");
  System.out.print("\t\t     *****************************\n");
 }
}
 
//Main.Java
 package LEP.uzair.bms.main;
 public class BankMain {
 public static void main(String[] args) {
  Start objectStart = new Start();
   objectStart.StartBank();
}
}

Output of the Program

 

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About Asad

Asad Niazi is Software Engineer , Programmer, Web Developer and a young mentor of BloggersTown and PProgramming. Asad Love to writes about Technology, Programming, Blogging and make money online.