Countdown Timer (Java)

A simple console-based countdown timer written in Java.
The program allows the user to enter hours, minutes, and seconds, then counts down in real time while updating the display on a single console line. This program shows my learning of for loops, .flush and thread handling.

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Features

• Accepts user input for hours, minutes, and seconds
• Converts all time into total seconds for accurate countdown logic
• Displays remaining time in HH:MM:SS format
• Updates the countdown on the same line (no console spam)
• Uses Thread.sleep(1000) for real-time countdown
• Beginner-friendly and easy to understand

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How It Works

1. The user enters hours, minutes, and seconds
2. The program converts the input into total seconds
3. A countdown loop runs from the total seconds down to zero
4. Each second:
   • The remaining time is recalculated
   • The console line is overwritten using \r
   • Output is flushed to ensure immediate display
5. When the timer reaches zero, the program ends

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Technologies Used

• Java
• Scanner (user input)
• Console output (System.out.printf)
• Thread handling (Thread.sleep)

Author

Kaelin Kesavjee