💻 10 Java Mini Projects for Beginners 🚀

One of the best ways to improve your Java skills is by building small, focused projects. Each project here is simple enough for a beginner, yet meaningful enough to teach real programming concepts.

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1. Number Guessing Game 🎯

The computer picks a number, and the user tries to guess it.

Features:

• Generates a random number
• Takes user input and gives feedback ("Too high" / "Too low")
• Tracks the number of attempts
• Option to replay

Java Concepts Used:

• Scanner for input
• Random for number generation
• while loop
• if-else conditions

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2. Basic Calculator App ➕➖✖️➗

Perform basic arithmetic operations based on user input.

Features:

• Input two numbers and an operator (+, -, *, /)
• Displays result
• Handles division by zero
• Optional: Menu-driven operation

Java Concepts Used:

• switch-case statements
• Arithmetic operators
• Input with Scanner
• Optional: methods for each operation

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3. To-Do List (Console App) ✅

Manage tasks from the command line.

Features:

• Add, view, and delete tasks
• Optional: Save/load tasks from a file

Java Concepts Used:

• ArrayList or arrays
• for loop for display
• File handling with FileWriter and BufferedReader (optional)
• CRUD operations

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4. Password Generator 🔐

Create secure passwords with custom length and options.

Features:

• Choose length and character types
• Generate random passwords
• Optionally generate multiple at once

Java Concepts Used:

• Random class
• StringBuilder
• char[] and string operations
• Loops and conditionals

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5. Dice Roller Simulator 🎲

Simulate rolling dice and show the result.

Features:

• Roll one or two dice
• Show total and individual values
• Optional: Display using basic GUI or ASCII

Java Concepts Used:

• Random
• JOptionPane or console output
• Loops
• Arrays (for roll history)

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6. Rock-Paper-Scissors ✊✋✌️

Play against the computer.

Features:

• Accepts user input
• Random computer choice
• Determines winner
• Score tracking and replay

Java Concepts Used:

• Random and Scanner
• if-else or switch-case logic
• Loops for multiple rounds
• Score using variables

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7. Quiz App (MCQs) ❓

Ask questions and track the user’s score.

Features:

• Displays question and multiple options
• Takes user answer and checks correctness
• Score shown at end

Java Concepts Used:

• Arrays or ArrayList
• Loops and input with Scanner
• if-else to check answers
• Optional: class to store questions

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8. Countdown Timer ⏱️

Countdown from a user-defined number.

Features:

• User sets time
• Shows time in seconds
• Optional: Sound or message when done

Java Concepts Used:

• Thread.sleep()
• try-catch for exceptions
• Loops
• Optional GUI with JOptionPane

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9. Tip Calculator 🍽️

Calculate how much tip to leave and split bills.

Features:

• Input bill, tip %, and number of people
• Output total tip, total amount, per-person split
• Input validation

Java Concepts Used:

• Scanner for input
• double for calculations
• Math operators
• String.format() or DecimalFormat

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10. Weather App (API-based) ☁️🌤️

Fetch real-time weather data using an API.

Features:

• User inputs a city
• App shows current temperature and conditions
• Optional: Add icons, GUI, or 5-day forecast

Java Concepts Used:

• HttpURLConnection
• JSON parsing with Gson or org.json
• Exception handling
• Optional: Swing or JavaFX for GUI

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Final Thoughts

You don’t need to build massive apps to get better at Java. These mini projects help reinforce core concepts while keeping things fun and practical. Start with one, build it out, then tweak and experiment.

That’s how real learning happens.

Happy coding! 👩‍💻🚀

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