Why use the retrospective version of the JSR 166 framework in the Java library

Reasons for the retrospective version of the JSR 166 framework in the Java library The JSR 166 (Java specification request 166) is the specification of concurrent programming in the Java platform.The JSR 166 framework was introduced in the Java SE 5 and was improved and expanded in the subsequent Java version.However, in order to meet certain requirements or compatibility requirements, sometimes the retrospective version of the JSR 166 framework still needs to be used.Here are some reasons why you need to use the retrospective version: 1. Compatibility requirements: For some reasons, the JSR 166 framework may be used in the old version of Java.The old version of Java may not support the latest version of the JSR 166 framework, so the retrospective version needs to be used to meet the compatibility requirements. 2. Specific demand: Some projects may have specific requirements and need to use the old version of the JSR 166 framework.The retrospective version can provide known, stable characteristics and behaviors to meet the needs of the project. 3. Old version of Java SE: In some cases, it may need to be developed in the old version of Java SE.This means that you can only use the functions and libraries provided by this version of Java.The use of the JSR 166 framework with a retrospective version can expand the function of concurrent programming, so as to achieve more powerful concurrent performance in the old version of Java SE. Below is a Java code example using the JSR 166 framework version: import jsr166e.*; public class BackportExample { public static void main(String[] args) { // Use a thread pool with a retrospective version ForkJoinPool pool = new ForkJoinPool(); // Create parallel tasks RecursiveTask<Integer> task = new RecursiveTask<Integer>() { @Override protected Integer compute() { // Execute parallel tasks // Back results } }; // Submit the parallel task to the thread pool int result = pool.invoke(task); // The result of the output parallel task System.out.println("Result: " + result); // Close the thread pool pool.shutdown(); } } In this example, we use one of the retrospectives of the JSR 166 framework, namely the class in the JSR166E package.By creating a ForkjoinPool object, we can perform parallel tasks in the concurrent environment (that is, recursivetask) and get the results of the task.This retrospective JSR 166 framework can provide the ability to use concurrent programming in the old version of Java.