The technical function introduction provided by the Apache Yetus Audience Annotations framework in the Java class library n java class libraries)

Apache Yetus Audience Annotations is part of the Apache Yetus project. It is a common Java annotation framework that marked the technical functions and audience information of the API in the Java class library. Apache Yetus Audience Annotations provides several types of annotations to help developers better understand and use the Java class library.The following is an introduction to the technical functions provided by the framework: 1. @Internal: Used to mark the internal use of the API.By using @Internal annotations, developers can clearly know which APIs are only for internal use and should not be used outside the class library.This helps to avoid unnecessary API exposure and errors. Example code: @Internal public void internalMethod() { // Realization of internal methods } 2. @Public: Public use for labeling API.By using @Public annotations, developers can clearly know which APIs are designed to be public and can be safely used outside the class library.This helps to provide good documents and guidance, so that developers clearly know which APIs can be used. Example code: @Public public void publicMethod() { // The implementation of public methods } 3. @Stability: Used to mark the stability level of the API.By using the @Stability annotation, developers can understand which APIs are stable versions, which may change or be discarded.This helps developers clear dependence and migration strategies. Example code: @Stability(Stability.Level.STABLE) public void stableMethod() { // Realization of stable methods } 4. @unstable: Used to mark the instability of the API.By using @unstable annotations, developers can understand which APIs are unstable versions, and interface changes or reconstruction may occur.This helps developers keep vigilant when using these APIs to prevent potential incompatibility. Example code: @Unstable public void unstableMethod() { // Realization of unstable methods } 5. @Evolving: The evolution version for label API.By using @Evolving annotations, developers can understand which APIs are under evolution and improvement.This helps developers understand future changes and possible updates in order to consider these changes in design and implementation. Example code: @Evolving public void evolvingMethod() { // Realization of the evolution method } Apache Yetus Audience Annotations framework provides a clear technical function and audience information for the Java library, making it easier for developers to understand and use APIs in the class library.By using these annotations reasonably, the readability, stability and maintenance of the code can be improved.