How do I install the 141 Java Refactoring With Modern Features skill?

Run npx skillmds add majiayu000/141-java-refactoring-with-modern-features in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is 141 Java Refactoring With Modern Features safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: docs only. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with 141 Java Refactoring With Modern Features?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is 141 Java Refactoring With Modern Features free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published 141 Java Refactoring With Modern Features?

majiayu000 (@majiayu000) published this skill. Their other Agent Skills are listed on their SkillMD profile.

141 Java Refactoring With Modern Features by majiayu000

Name: 141 Java Refactoring With Modern Features
Rating: 4.2 (5 reviews)
Author: majiayu000

141 Java Refactoring With Modern Features

Use when you need to refactor Java code to adopt modern Java features (Java 8+) — including migrating anonymous classes to lambdas, replacing Iterator loops with Stream API, adopting Optional for null safety, switching from legacy Date/Calendar to java.time, using collection factory methods, migrating to CompletableFuture for async operations, applying text blocks, var inference, or leveraging Java 25 features like flexible constructor bodies and module import declarations.

majiayu000 c6aa61f 2 files · 3.2 KB Updated Sep 9, 2026 567 repo stars

File contents

Modern Java Development Guidelines (Java 8+)

Identify and apply modern Java (Java 8+) refactoring opportunities to improve readability, maintainability, and performance.

Core areas: Lambda expressions and method references (over anonymous classes), Stream API for declarative collection processing, Optional for null-safe APIs, java.time API (replacing Date/Calendar), default interface methods, var type inference, unmodifiable collection factory methods (List.of(), Set.of(), Map.of()), CompletableFuture for composable async programming, text blocks for multi-line strings, Java 25 Flexible Constructor Bodies (JEP 513), and Java 25 Module Import Declarations (JEP 511).

Prerequisites: Run ./mvnw compile or mvn compile before applying any changes. If compilation fails, stop immediately — do not proceed until the project compiles successfully.

Multi-step scope: Step 1 validates compilation. Step 2 categorizes refactoring opportunities by impact (CRITICAL, MAINTAINABILITY, PERFORMANCE, READABILITY). Step 3 applies lambda/method-reference conversions. Step 4 replaces imperative loops with Stream API pipelines. Step 5 introduces Optional for null-safe method returns. Step 6 migrates legacy date/time to java.time. Step 7 adopts collection factory methods and async CompletableFuture patterns. Step 8 applies text blocks, var, and Java 25 features where applicable. Step 9 runs ./mvnw clean verify to confirm all tests pass after changes.

Before applying changes: Read the reference for detailed good/bad examples, constraints, and safeguards for each modern Java feature.

Reference

For detailed guidance, examples, and constraints, see references/141-java-refactoring-with-modern-features.md.

---name: 141-java-refactoring-with-modern-featuresdescription: Use when you need to refactor Java code to adopt modern Java features (Java 8+) — including migrating anonymous classes to lambdas, replacing Iterator loops with Stream API, adopting Optional for null safety, switching from legacy Date/Calendar to java.time, using collection factory methods, migrating to CompletableFuture for async operations, applying text blocks, var inference, or leveraging Java 25 features like flexible constructor bodies and module import declarations.---# Modern Java Development Guidelines (Java 8+) Identify and apply modern Java (Java 8+) refactoring opportunities to improve readability, maintainability, and performance. **Core areas:** Lambda expressions and method references (over anonymous classes), Stream API for declarative collection processing, `Optional` for null-safe APIs, `java.time` API (replacing `Date`/`Calendar`), default interface methods, `var` type inference, unmodifiable collection factory methods (`List.of()`, `Set.of()`, `Map.of()`), `CompletableFuture` for composable async programming, text blocks for multi-line strings, Java 25 Flexible Constructor Bodies (JEP 513), and Java 25 Module Import Declarations (JEP 511). **Prerequisites:** Run `./mvnw compile` or `mvn compile` before applying any changes. If compilation fails, **stop immediately** — do not proceed until the project compiles successfully. **Multi-step scope:** Step 1 validates compilation. Step 2 categorizes refactoring opportunities by impact (CRITICAL, MAINTAINABILITY, PERFORMANCE, READABILITY). Step 3 applies lambda/method-reference conversions. Step 4 replaces imperative loops with Stream API pipelines. Step 5 introduces Optional for null-safe method returns. Step 6 migrates legacy date/time to `java.time`. Step 7 adopts collection factory methods and async CompletableFuture patterns. Step 8 applies text blocks, var, and Java 25 features where applicable. Step 9 runs `./mvnw clean verify` to confirm all tests pass after changes. **Before applying changes:** Read the reference for detailed good/bad examples, constraints, and safeguards for each modern Java feature. ## Reference For detailed guidance, examples, and constraints, see [references/141-java-refactoring-with-modern-features.md](references/141-java-refactoring-with-modern-features.md).

Frequently asked questions