141-java-refactoring-with-modern-features

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Chinese

Modern Java Development Guidelines (Java 8+)

现代Java开发指南（Java 8+）

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

What is covered in this Skill?

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()
```
)
Text blocks for multi-line strings
Java 25 Flexible Constructor Bodies (JEP 513)
Java 25 Module Import Declarations (JEP 511)

Scope: The reference is organized by examples (good/bad code patterns) for each core area. Apply recommendations based on applicable examples.

识别并应用现代Java（Java 8+）重构机会，以提升代码的可读性、可维护性和性能。

本Skill涵盖哪些内容？

Lambda表达式和方法引用（替代匿名类）
用于声明式集合处理的Stream API
用于空值安全API的
```
Optional
```
```
java.time
```
API（替代
```
Date
```
/
```
Calendar
```
）
默认接口方法、
```
var
```
类型推断
不可修改集合工厂方法（
```
List.of()
```
、
```
Set.of()
```
、
```
Map.of()
```
）
用于多行字符串的文本块
Java 25灵活构造函数体（JEP 513）
Java 25模块导入声明（JEP 511）

适用范围： 本参考文档按每个核心领域的示例（好/坏代码模式）组织。请根据适用的示例应用建议。

Constraints

约束条件

Before applying any modern Java refactoring, ensure the project compiles. If compilation fails, stop immediately — do not proceed until the project compiles successfully. After applying improvements, run full verification.

MANDATORY: Run
```
./mvnw compile
```
or
```
mvn compile
```
before applying any changes
SAFETY: If compilation fails, stop immediately — do not proceed until the project compiles successfully
VERIFY: Run
```
./mvnw clean verify
```
or
```
mvn clean verify
```
after applying improvements
BEFORE APPLYING: Read the reference for detailed good/bad examples, constraints, and safeguards for each modern Java feature

在应用任何现代Java重构之前，确保项目可以编译。如果编译失败，请立即停止——在项目成功编译前不要继续。应用改进后，运行完整验证。

强制要求：在应用任何更改前运行
```
./mvnw compile
```
或
```
mvn compile
```
安全提示：如果编译失败，请立即停止——在项目成功编译前不要继续
验证：应用改进后运行
```
./mvnw clean verify
```
或
```
mvn clean verify
```
应用前准备：阅读参考文档，了解每个现代Java特性的详细好/坏示例、约束条件和防护措施

When to use this skill

何时使用本Skill

Review Java code for modern Java development
Apply best practices for modern Java development in Java code

审查Java代码以进行现代Java开发
在Java代码中应用现代Java开发的最佳实践

Reference

参考资料

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

如需详细指南、示例和约束条件，请参阅references/141-java-refactoring-with-modern-features.md。