Mini Banking Application in Java

Last Updated : 15 Dec, 2021

In any Bank Transaction, there are several parties involved to process transaction like a merchant, bank, receiver, etc. so there are several numbers reasons that transaction may get failed, declined, so to handle a transaction in Java, there is a JDBC (Java Database Connectivity) which provides us an API to connect, execute, fetch data from any databases. It provides the language Java database connectivity standards. It is used to write programs required to access databases.

Transactions in JDBC provide us a feature that considers a complete SQL statement as one unit, then executes once, and if any statement fails, the entire transaction fails. To use transaction, we have to set setAutoCommit(false); manually, and once all the statements are executed successfully, making changes in the database’s commit() method will be required.

In this Mini Banking Application, to handle a transaction, we are using JDBC Transaction to make transactions consistent. This Application Provides Menu-Driven Console Interface to a User Using that User can perform functions like create Account, Login, View Balance And Transfer Money To The Other Customer.

Software Prerequisite:

MySQL
Eclipse

MySQL:

MySQL is a full-featured relational database management system (RDBMS). MySQL is a free, open-source relational database management system that uses Structured Query Language (SQL), the most popular language for adding, accessing, and processing data in a database. MySQL is noted for its speed, reliability, and flexibility.

Eclipse:

Eclipse is an IDE (interactive development environment) written to develop and debug (primarily) Java code. It contains a base workspace and an extensible plug-in system for customizing the environment.

Databases Setup:

Step 1: Create Database name bank

Step 2: Create Table name customer

// Create a database 
CREATE DATABASE BANK; 


// Create table
CREATE TABLE `customer` (

 `ac_no` int NOT NULL AUTO_INCREMENT,

 `cname` varchar(45) DEFAULT NULL,

 `balance` varchar(45) DEFAULT NULL,

 `pass_code` int DEFAULT NULL,

 PRIMARY KEY (`ac_no`),

 UNIQUE KEY `cname_UNIQUE` (`cname`)

) ;

Eclipse Project Setup:

Create New Project
Create A package name banking

File Configuration

File configuration

Create a Connection class in the banking package

Step 1: Include JDBC Driver for MySQL

// register jdbc Driver 
String mysqlJDBCDriver = "com.mysql.cj.jdbc.Driver";
Class.forName(mysqlJDBCDriver);

Step 2: Create Connection Class using MySQL username and password

// Create Connection
String url = "jdbc:mysql://localhost:3306/mydata";
String user = "root";
String pass = "123";
con = DriverManager.getConnection(url, user, pass);

>>connection.java

Java

package banking;
 
import java.sql.Connection;
import java.sql.DriverManager;
// Global connection Class
public class connection {
    static Connection con; // Global Connection Object
    public static Connection getConnection()
    {
        try {
            
            
            String mysqlJDBCDriver
                = "com.mysql.cj.jdbc.Driver"; //jdbc driver
            String url
                = "jdbc:mysql://localhost:3306/mydata"; //mysql url
            String user = "root";        //mysql username
            String pass = "Pritesh4@";  //mysql passcode
             Class.forName(mysqlJDBCDriver);
            con = DriverManager.getConnection(url, user,
                                              pass);
        }
        catch (Exception e) {
            System.out.println("Connection Failed!");
        }
 
        return con;
    }
}

Purpose: This class returns a Global Databases Connection using the object of connection all the commands will be executed.

Note: Create a Bank Management Class in the banking package

>> bankmanagment.java

Java

package banking;
 
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.SQLIntegrityConstraintViolationException;
import java.sql.Statement;
 
public class bankManagement { // these class provides all
                              // bank method
 
    private static final int NULL = 0;
 
    static Connection con = connection.getConnection();
    static String sql = "";
    public static boolean
    createAccount(String name,
                  int passCode) // create account function
    {
        try {
            // validation
            if (name == "" || passCode == NULL) {
                System.out.println("All Field Required!");
                return false;
            }
            // query
            Statement st = con.createStatement();
            sql = "INSERT INTO customer(cname,balance,pass_code) values('"
                  + name + "',1000," + passCode + ")";
 
            // Execution
            if (st.executeUpdate(sql) == 1) {
                System.out.println(name
                                   + ", Now You Login!");
                return true;
            }
            // return
        }
        catch (SQLIntegrityConstraintViolationException e) {
            System.out.println("Username Not Available!");
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }
    public static boolean
    loginAccount(String name, int passCode) // login method
    {
        try {
            // validation
            if (name == "" || passCode == NULL) {
                System.out.println("All Field Required!");
                return false;
            }
            // query
            sql = "select * from customer where cname='"
                  + name + "' and pass_code=" + passCode;
            PreparedStatement st
                = con.prepareStatement(sql);
            ResultSet rs = st.executeQuery();
            // Execution
            BufferedReader sc = new BufferedReader(
                new InputStreamReader(System.in));
 
            if (rs.next()) {
                // after login menu driven interface method
 
                int ch = 5;
                int amt = 0;
                int senderAc = rs.getInt("ac_no");
                ;
                int receiveAc;
                while (true) {
                    try {
                        System.out.println(
                            "Hallo, "
                            + rs.getString("cname"));
                        System.out.println(
                            "1)Transfer Money");
                        System.out.println("2)View Balance");
                        System.out.println("5)LogOut");
 
                        System.out.print("Enter Choice:");
                        ch = Integer.parseInt(
                            sc.readLine());
                        if (ch == 1) {
                            System.out.print(
                                "Enter Receiver  A/c No:");
                            receiveAc = Integer.parseInt(
                                sc.readLine());
                            System.out.print(
                                "Enter Amount:");
                            amt = Integer.parseInt(
                                sc.readLine());
 
                            if (bankManagement
                                    .transferMoney(
                                        senderAc, receiveAc,
                                        amt)) {
                                System.out.println(
                                    "MSG : Money Sent Successfully!\n");
                            }
                            else {
                                System.out.println(
                                    "ERR :  Failed!\n");
                            }
                        }
                        else if (ch == 2) {
 
                            bankManagement.getBalance(
                                senderAc);
                        }
                        else if (ch == 5) {
                            break;
                        }
                        else {
                            System.out.println(
                                "Err : Enter Valid input!\n");
                        }
                    }
                    catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
            else {
                return false;
            }
            // return
            return true;
        }
        catch (SQLIntegrityConstraintViolationException e) {
            System.out.println("Username Not Available!");
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }
    public static void
    getBalance(int acNo) // fetch balance method
    {
        try {
 
            // query
            sql = "select * from customer where ac_no="
                  + acNo;
            PreparedStatement st
                = con.prepareStatement(sql);
 
            ResultSet rs = st.executeQuery(sql);
            System.out.println(
                "-----------------------------------------------------------");
            System.out.printf("%12s %10s %10s\n",
                              "Account No", "Name",
                              "Balance");
 
            // Execution
 
            while (rs.next()) {
                System.out.printf("%12d %10s %10d.00\n",
                                  rs.getInt("ac_no"),
                                  rs.getString("cname"),
                                  rs.getInt("balance"));
            }
            System.out.println(
                "-----------------------------------------------------------\n");
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
    public static boolean transferMoney(int sender_ac,
                                        int reveiver_ac,
                                        int amount)
        throws SQLException // transfer money method
    {
        // validation
        if (reveiver_ac == NULL || amount == NULL) {
            System.out.println("All Field Required!");
            return false;
        }
        try {
            con.setAutoCommit(false);
            sql = "select * from customer where ac_no="
                  + sender_ac;
            PreparedStatement ps
                = con.prepareStatement(sql);
            ResultSet rs = ps.executeQuery();
 
            if (rs.next()) {
                if (rs.getInt("balance") < amount) {
                    System.out.println(
                        "Insufficient Balance!");
                    return false;
                }
            }
 
            Statement st = con.createStatement();
 
            // debit
            con.setSavepoint();
 
            sql = "update customer set balance=balance-"
                  + amount + " where ac_no=" + sender_ac;
            if (st.executeUpdate(sql) == 1) {
                System.out.println("Amount Debited!");
            }
 
            // credit
            sql = "update customer set balance=balance+"
                  + amount + " where ac_no=" + reveiver_ac;
            st.executeUpdate(sql);
 
            con.commit();
            return true;
        }
        catch (Exception e) {
            e.printStackTrace();
            con.rollback();
        }
        // return
        return false;
    }
}

Purpose: This class will provide all the methods of Bank Management like transferring money, viewing balance, creating an account, and log in.

Note: Create a User Menu Class (bank.java) in the banking package.

>>bank.java

Java

package banking;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
public class bank {
    public static void main(String args[]) //main class of bank
        throws IOException
    {
 
        BufferedReader sc = new BufferedReader(
            new InputStreamReader(System.in));
        String name = "";
        int pass_code;
        int ac_no;
        int ch;
 
        while (true) {
            System.out.println(
                "\n ->||    Welcome to InBank    ||<- \n");
            System.out.println("1)Create Account");
            System.out.println("2)Login Account");
 
            try {
                System.out.print("\n    Enter Input:"); //user input 
                ch = Integer.parseInt(sc.readLine());
 
                switch (ch) {
                case 1:
                    try {
                        System.out.print(
                            "Enter Unique UserName:");
                        name = sc.readLine();
                        System.out.print(
                            "Enter New Password:");
                        pass_code = Integer.parseInt(
                            sc.readLine());
 
                        if (bankManagement.createAccount(
                                name, pass_code)) {
                            System.out.println(
                                "MSG : Account Created Successfully!\n");
                        }
                        else {
                            System.out.println(
                                "ERR : Account Creation Failed!\n");
                        }
                    }
                    catch (Exception e) {
                        System.out.println(
                            " ERR : Enter Valid Data::Insertion Failed!\n");
                    }
                    break;
 
                case 2:
                    try {
                        System.out.print(
                            "Enter  UserName:");
                        name = sc.readLine();
                        System.out.print(
                            "Enter  Password:");
                        pass_code = Integer.parseInt(
                            sc.readLine());
 
                        if (bankManagement.loginAccount(
                                name, pass_code)) {
                            System.out.println(
                                "MSG : Logout Successfully!\n");
                        }
                        else {
                            System.out.println(
                                "ERR : login Failed!\n");
                        }
                    }
                    catch (Exception e) {
                        System.out.println(
                            " ERR : Enter Valid Data::Login Failed!\n");
                    }
 
                    break;
 
                default:
                    System.out.println("Invalid Entry!\n");
                }
 
                if (ch == 5) {
                    System.out.println(
                        "Exited Successfully!\n\n Thank You :)");
                    break;
                }
            }
            catch (Exception e) {
                System.out.println("Enter Valid Entry!");
            }
        }
        sc.close();
    }
}

Output: This class provides a Menu-Driven Interface to the Customer where the Customer can create Account, Login Account, Transfer Money, etc.

Login:

  ->||    Welcome to InBank    ||<- 

    1)Create Account
    2)Login Account

    Enter Input:2
Enter  UserName:pritesh
Enter  Password:123

View Balance:

Enter  UserName:pritesh
Enter  Password:123
Hallo, pritesh
1)Transfer Money
2)View Balance
5)LogOut
Enter Choice:2
-----------------------------------------------------------
  Account No       Name    Balance
         112    pritesh          0.00
-----------------------------------------------------------

Transfer Money:

Hallo, pritesh
1)Transfer Money
2)View Balance
5)LogOut
Enter Choice:1
Enter Receiver  A/c No:110
Enter Amount:5000
Insufficient Balance!
ERR :  Failed!

Logout:

Hallo, pritesh
1)Transfer Money
2)View Balance
5)LogOut
Enter Choice:5
MSG : Logout Successfully!

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Mini Banking Application in Java

Software Prerequisite:

MySQL:

Eclipse:

Databases Setup:

Eclipse Project Setup:

File Configuration

>>connection.java

Java

>> bankmanagment.java

Java

>>bank.java

Java

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