Builder Design Pattern — Java Example
Pattern: Creational → Builder Article: https://ankurm.com/builder-design-pattern-java/
What this example shows
An immutable HttpRequest assembled step by step instead of through a constructor with a dozen optional parameters. HttpRequest is the product — built once, never mutated afterward. HttpClientConfig is a director-style helper that encapsulates common request configurations so callers don't repeat the same builder calls. Main wires it together and shows the fluent builder chain in action.
How to run
javac builder/*.java -d out/builder
java -cp out/builder builder.Main
Requires Java 25.
Post Section ↔ File Mapping
| Post Section | File(s) |
|---|---|
| Part 1 — The Product: HttpRequest (Immutable) | HttpRequest.java |
| Part 2 — The Director: Encapsulating Common Configurations | HttpClientConfig.java |
| Part 3 — Using the Builder: Client Code | Main.java |
Note: the Lombok @Builder example and the JDK standard-library snippets (HttpRequest.newBuilder(), StringBuilder, ProcessBuilder) are illustrative only — they are not part of this repository's runnable example.
Article: https://ankurm.com/builder-design-pattern-java/ All patterns: https://ankurm.com/design-patterns-java/