36 lines
1.6 KiB
Markdown
36 lines
1.6 KiB
Markdown
# Facade Design Pattern — Java Example
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**Pattern:** Structural → Facade
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**Article:** https://ankurm.com/facade-design-pattern-java/
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## What this example shows
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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.
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## How to run
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```bash
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javac facade/*.java -d out/facade
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java -cp out/facade facade.Main
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```
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Requires Java 25.
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## Post Section ↔ File Mapping
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| Post Section | File(s) |
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|---|---|
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| The Subsystem (Complex, But Unchanged) — VideoFile | `VideoFile.java` |
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| The Subsystem (Complex, But Unchanged) — Codec interface | `Codec.java` |
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| The Subsystem (Complex, But Unchanged) — Concrete Codecs | `MPEG4CompressionCodec.java`, `OggCompressionCodec.java` |
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| The Subsystem (Complex, But Unchanged) — CodecFactory | `CodecFactory.java` |
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| The Subsystem (Complex, But Unchanged) — BitrateReader | `BitrateReader.java` |
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| The Subsystem (Complex, But Unchanged) — AudioMixer | `AudioMixer.java` |
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| The Facade | `VideoConversionFacade.java` |
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| Client Code: One Line | `Main.java` |
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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.
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Article: https://ankurm.com/facade-design-pattern-java/
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All patterns: https://ankurm.com/design-patterns-java/
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