Facade Design Pattern — Java Example
Pattern: Structural → Facade Article: https://ankurm.com/facade-design-pattern-java/
What this example shows
A video-conversion subsystem (VideoFile, Codec, MPEG4CompressionCodec, OggCompressionCodec, CodecFactory, BitrateReader, AudioMixer) is wrapped behind one class, VideoConversionFacade, that exposes a single convertVideo() method. Callers never touch the six subsystem classes directly, but they remain public and usable on their own for advanced use cases.
How to run
javac facade/*.java -d out/facade
java -cp out/facade facade.Main
Requires Java 25.
Post Section ↔ File Mapping
| Post Section | File(s) |
|---|---|
| The Subsystem (Complex, But Unchanged) — VideoFile | VideoFile.java |
| The Subsystem (Complex, But Unchanged) — Codec interface | Codec.java |
| The Subsystem (Complex, But Unchanged) — Concrete Codecs | MPEG4CompressionCodec.java, OggCompressionCodec.java |
| The Subsystem (Complex, But Unchanged) — CodecFactory | CodecFactory.java |
| The Subsystem (Complex, But Unchanged) — BitrateReader | BitrateReader.java |
| The Subsystem (Complex, But Unchanged) — AudioMixer | AudioMixer.java |
| The Facade | VideoConversionFacade.java |
| Client Code: One Line | Main.java |
Note: the SLF4J LoggerFactory, JDBC DriverManager, and Spring JdbcTemplate snippets under "Facade in the JDK and Real Frameworks" are illustrative only — they are not part of this repository's runnable example.
Article: https://ankurm.com/facade-design-pattern-java/ All patterns: https://ankurm.com/design-patterns-java/