Banking Application in Java

2025年5月9日 | 阅读 3 分钟

在本节中，我们将学习如何在 Java 中创建一个银行系统迷你应用程序。在此程序中，我们将添加一些银行账户的基本功能，如存款、取款等。

最初，程序接受我们需要添加的客户数量，并相应地添加客户和账户详细信息。此外，它会显示一系列菜单来操作账户。

显示的菜单系列如下：

显示所有账户详细信息
按账号搜索
存款
取款
退出

Java 银行应用程序系统程序

BankingApp.java

import java.util.Scanner;
class BankDetails {
    private String accno;
    private String name;
    private String acc_type;
    private long balance;
    Scanner sc = new Scanner(System.in);
    //method to open new account
    public void openAccount() {
        System.out.print("Enter Account No: ");
        accno = sc.next();
        System.out.print("Enter Account type: ");
        acc_type = sc.next();
        System.out.print("Enter Name: ");
        name = sc.next();
        System.out.print("Enter Balance: ");
        balance = sc.nextLong();
    }
    //method to display account details
    public void showAccount() {
        System.out.println("Name of account holder: " + name);
        System.out.println("Account no.: " + accno);
        System.out.println("Account type: " + acc_type);
        System.out.println("Balance: " + balance);
    }
    //method to deposit money
    public void deposit() {
        long amt;
        System.out.println("Enter the amount you want to deposit: ");
        amt = sc.nextLong();
        balance = balance + amt;
    }
    //method to withdraw money
    public void withdrawal() {
        long amt;
        System.out.println("Enter the amount you want to withdraw: ");
        amt = sc.nextLong();
        if (balance >= amt) {
            balance = balance - amt;
            System.out.println("Balance after withdrawal: " + balance);
        } else {
            System.out.println("Your balance is less than " + amt + "\tTransaction failed...!!" );
        }
    }
    //method to search an account number
    public boolean search(String ac_no) {
        if (accno.equals(ac_no)) {
            showAccount();
            return (true);
        }
        return (false);
    }
}
public class BankingApp {
    public static void main(String arg[]) {
        Scanner sc = new Scanner(System.in);
        //create initial accounts
        System.out.print("How many number of customers do you want to input? ");
        int n = sc.nextInt();
        BankDetails C[] = new BankDetails[n];
        for (int i = 0; i < C.length; i++) {
            C[i] = new BankDetails();
            C[i].openAccount();
        }
        // loop runs until number 5 is not pressed to exit
        int ch;
        do {
            System.out.println("\n ***Banking System Application***");
            System.out.println("1. Display all account details \n 2. Search by Account number\n 3. Deposit the amount \n 4. Withdraw the amount \n 5.Exit ");
            System.out.println("Enter your choice: ");
            ch = sc.nextInt();
                switch (ch) {
                    case 1:
                        for (int i = 0; i < C.length; i++) {
                            C[i].showAccount();
                        }
                        break;
                    case 2:
                        System.out.print("Enter account no. you want to search: ");
                        String ac_no = sc.next();
                        boolean found = false;
                        for (int i = 0; i < C.length; i++) {
                            found = C[i].search(ac_no);
                            if (found) {
                                break;
                            }
                        }
                        if (!found) {
                            System.out.println("Search failed! Account doesn't exist..!!");
                        }
                        break;
                    case 3:
                        System.out.print("Enter Account no. : ");
                        ac_no = sc.next();
                        found = false;
                        for (int i = 0; i < C.length; i++) {
                            found = C[i].search(ac_no);
                            if (found) {
                                C[i].deposit();
                                break;
                            }
                        }
                        if (!found) {
                            System.out.println("Search failed! Account doesn't exist..!!");
                        }
                        break;
                    case 4:
                        System.out.print("Enter Account No : ");
                        ac_no = sc.next();
                        found = false;
                        for (int i = 0; i < C.length; i++) {
                            found = C[i].search(ac_no);
                            if (found) {
                                C[i].withdrawal();
                                break;
                            }
                        }
                        if (!found) {
                            System.out.println("Search failed! Account doesn't exist..!!");
                        }
                        break;
                    case 5:
                        System.out.println("See you soon...");
                        break;
                }
            }
            while (ch != 5);
        }
    }

输出 1