# 1️⃣ Pull the artifact from our Maven repository mvn dependency:get \ -Dartifact=com.mimk:javhd-engine:054.2021.01.09:jar
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public sealed interface Shape permits Circle, Rectangle, Square {} # 1️⃣ Pull the artifact from our Maven
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| ✅ Done | ❌ Pending | Migration Item | |--------|-----------|----------------| | ☑️ | ☐ | to new projects; for legacy apps, start with automatic modules ( --add-modules ) to test compatibility. | | ☑️ | ☐ | Replace old anonymous Runnable s with lambdas wherever possible. | | ☑️ | ☐ | Convert collection‑heavy loops to streams; benchmark critical paths (parallel streams can be a double‑edged sword). | | ☑️ | ☐ | Introduce Optional for API return types instead of null . | | ☑️ | ☐ | Refactor POJOs into record s if they are immutable data carriers. | | ☑️ | ☐ | Use var for local variables where the type is evident from the right‑hand side. | | ☑️ | ☐ | Rewrite switch statements with the new expression form for clarity and exhaustiveness. |