PinnacleBankCore is a fully menu-driven console banking application developed using pure Core Java, demonstrating enterprise-level OOP principles, custom exception handling, and clean layered architecture.
⚡ No frameworks. No databases. Pure Core Java fundamentals — Perfect for Java interviews, OOP mastery, and fresher portfolios.
Build a scalable banking system showcasing:
- ✅ SOLID principles in action
- ✅ 7+ custom business exceptions
- ✅ Real-world banking logic (interest, min balance, daily limits)
- ✅ Professional console UI with formatted tables
--------------------- Main Menu ---------------------
1:Add Account 2:Display All 3:Search Account
4:Transaction 5:Update 6:Delete Account
7:Add Interest 8:Account Statement
Choose (1-8): 1
Customer ID: 101
Customer Name: Hitesh Mane
Account No: 123456
IFSC Code: SBIN0001234
Initial Balance (₹): 5000
Type (SAVINGS/CURRENT): SAVINGS
Interest Rate (%): 6.5
✅ Account created: Hitesh Mane
| Concept | Implementation | Business Value |
|---|---|---|
| Inheritance | Account → SavingsAccount/CurrentAccount | Account hierarchy |
| Polymorphism | addInterestToAllAccounts() | Uniform processing |
| Abstraction | BankAccount interface + Account abstract | Clean contracts |
| Encapsulation | Private fields + validation | Data integrity |
| Collections | ArrayList<Customer>, List<Transaction> | Efficient storage |
| Exception Handling | 7+ custom checked exceptions | Rule enforcement |
| Enums | AccountType, TransactionType | Type safety |
| Streams/Lambdas | Duplicate checks, searches | Modern Java |
| Feature | Savings Account | Current Account | Status |
|---|---|---|---|
| Create Account | ✅ ₹1000 min balance | ✅ Business accounts | 🟢 Complete |
| Deposit/Withdraw | ✅ Transaction history | ✅ Transaction history | 🟢 Complete |
| Interest | ✅ 6.5% monthly | ❌ Zero interest | 🟢 Complete |
| Search | ID/AccNo/Name | ID/AccNo/Name | 🟢 Complete |
| Statement | Last N transactions | Last N transactions | 🟢 Complete |
| Update | Name + Address | Name + Address | 🟢 Complete |
| Delete | Balance=0 required | Balance=0 required | 🟢 Complete |
┌─────────────────┐ ┌──────────────────┐ ┌─────────────────┐
│ BankMain │ ───▶ │ BankServices │ ───▶ │ Customer │
│ (Controller) │ │ (Business Logic) │ │ ↕ │
└─────────────────┘ └──────────────────┘ │ Account │
│ ↕ │
│ Transactions │
│ Address │
└─────────────────┘
PinnacleBankCore/
├── BankMain.java
├── service/
│ └── BankServices.java
├── model/
│ ├── entity/
│ │ ├── BankAccount.java
│ │ ├── Account.java
│ │ ├── SavingsAccount.java
│ │ ├── CurrentAccount.java
│ │ ├── Customer.java
│ │ ├── Transaction.java
│ │ └── Address.java
│ └── enums/
│ ├── AccountType.java
│ └── TransactionType.java
├── exceptions/
│ ├── AccountNotFoundException.java
│ ├── DuplicateAccountException.java
│ ├── InsufficientFundsException.java
│ ├── InvalidAmountException.java
│ ├── MinimumBalanceException.java
│ ├── DailyLimitExceededException.java
│ └── InvalidIFSCException.java
└── util/
└── BankConstants.java
❌ AccountNotFoundException(101)
❌ DuplicateAccountException(123456)
❌ InsufficientFundsException(5000.00/2000.00)
❌ InvalidAmountException(-100.00)
❌ MinimumBalanceException(500.00)
❌ DailyLimitExceededException()
❌ InvalidIFSCException(INVALID123)
1. Clone the repository 2. Open the project in**Eclipse / IntelliJ IDEA** 3. Run `BankMain.java` 4. Use the console menu to interact- JDK 17+
- Any Java IDE
- ✅ Java Fresher Interviews
- ✅ OOP Concept Demonstration
- ✅ Core Java Portfolio
- ✅ Technical Round Preparation
- ✅ College Projects
- 📁 File Persistence (ObjectInputStream)
- 🔁 Account Transfers
- 🗄️ JDBC Integration (MySQL/PostgreSQL)
- 🧪 JUnit 5 Tests (95% coverage target)
- ⚡ Multithreading (concurrent transactions)
Hitesh Mane Java Backend Developer | Pune, India
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