Flappy Bird (Pure Java)
A complete browser-based Flappy Bird recreation in pure Java — custom game engine, physics, collision detection, all built from scratch.
Built by Sandeep Prajapati
JavaJava SwingAWTOOP
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Overview
A complete recreation of Flappy Bird built in pure Java — no game engine, no external libraries. Every part of it (rendering loop, physics, collision, scoring) is written from scratch using Java Swing and AWT, as an exercise in core game-programming fundamentals and object-oriented design.
What I Built
- Custom game loop — a fixed-timestep render/update cycle driving the animation
- Physics — gravity, flap impulse, and velocity integration for the bird's motion
- Collision detection — pixel/bounds checks between the bird and the pipes
- Procedural pipes — randomized gaps that scroll and recycle
- Scoring & game states — start, playing, and game-over screens with score tracking
- Keyboard input handling for the flap control
Tech Stack
Language: Java
UI / Rendering: Java Swing, AWT
Design: Object-oriented architecture (separate entities for bird, pipes, game manager)
Why It Matters
Building a game without an engine forced me to understand the fundamentals most frameworks hide — the render loop, frame timing, physics integration, and collision math — all in clean OOP Java.
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