Expense Tracker – SOLID Java Console Application
A simple, console-based Java application that helps users track income and expenses, categorize transactions,
generate monthly summaries, and save/load data to/from files. Built with clean design principles
using SOLID architecture.
🚀 Features
Add income or expense transactions
Categorize entries (e.g., Food, Rent, Travel, Salary, Business)
View monthly summaries of income, expenses, and savings
Save data to a txt file (in Downloads folder or custom path)
Load data from a previously saved file
Supports structured txt input for bulk transaction loading
📂 Project Structure
├── Main.java # Application entry point
├── ExpenseTracker.java # Main application logic
├── Transaction.java # Represents an income/expense record
├── TransactionType.java # Enum: INCOME or EXPENSE
├── transaction.txt # Generated txt file
├── README.md # Breif Description on Expense Tracker
📄 File Format (.txt)
Your txt file should follow this structure:
TYPE,AMOUNT,CATEGORY,DATE
INCOME,10000,Salary,2025-05-01
EXPENSE,3000,Food,2025-05-05
💻 How to Use
1.Clone this repositry to your local machine git clone https://github.com/your-username/expense-tracker-java.git cd expense-tracker-java Replace your-username with your actual GitHub username.
2.Compile and run:
Before Running Your Application pls change the path to download/load Files in ExpenseTracker.java
javac Main.java
java Main
3.Application Options
4.Enter your option
➕ Add Transaction
# For Exp: I'm adding a transcation of 45000 , which is INCOME,category salary
Once You've Entered the option 1, ie, add transcation It'll ask for the Type of the Transcation (Income /Expense)
Once You've Entered the Type, It'll ask for the amount
Once You've Entered the amount, It'll ask for the Category like food,salary etc
Once You've Entered the category , it will added the transcation successfully
📊 View Monthly Summary
# For Exp : If you want to see the Monthly Summary you can see via option 2.
# You Want to Save all the transactions you've done till know
Once You run the Application , It'll give you options, In that choose 4.Save to the file
It'll give the specific path where the file is saved.
📂 Load from File
#You want to load data/Transaction from a file
#Make sure you have change the path in ExpenseTracker.java & Inorder to load,make sure there exist one txt
#file with the name as specified int ExpenseTracker.java or Incase if you've change , your file name
Once this is done, it will load data form the file,
My transaction.txt file contains the below data
Once Application started, I'll give option : 3 to load
Once that is completed, Now see the monthly summary via Option:2
So the data/Summary which i've got is from the file
👨💻 Author
Built by Kishor Kumar - writing clean, maintainable Java code with SOLID design and real-world use cases in mind.