Analysis of technical principles in Java Library: Backport of JSR 16

JSR 16 is part of the Java specification, which aims to provide a method of introducing the new version of the Java library function into the old version of the Java platform.Backport of JSR 16 is a supplement to this specification. It allows developers to use the new version of the library -class function on the old version of the Java platform. Backport of JSR 16's technical principles mainly include the following points: 1. Edition compatibility: Backport of JSR 16 Integrate the new version of the Java library function to the old version of the Java platform by using backward compatibility.This means that developers can still use the new version of the library function without upgrading the Java platform, thereby avoiding a series of problems brought by upgrading the Java platform. 2. Feature copy: Backport of JSR 16 will copy the characteristics of the new version of the Java class library to the old version of the Java platform.This means that developers can obtain functions in the new version of libraries by introducing a specific backPort library.For example, you can use the Backport of JSR 16 to use the new version of the concurrent library on the old version of the Java platform, thereby improving the performance and concurrent processing capacity of the program. Below is a simple example of using Backport of JSR 16: import java.util.concurrent.ConcurrentHashMap; import edu.umd.cs.findbugs.annotations.SuppressFBWarnings; public class BackportExample { @SuppressFBWarnings("MS_MUTABLE_COLLECTION") public static void main(String[] args) { ConcurrentHashMap<String, Integer> map = new ConcurrentHashMap<String, Integer>(); map.put("One", 1); map.put("Two", 2); map.put("Three", 3); System.out.println("Map size: " + map.size()); Integer value = map.get("Two"); System.out.println("Value of key 'Two': " + value); map.remove("Three"); System.out.println("Map size after removal: " + map.size()); } } In the above examples, we use the ConcurrenThashMap class in Backport of JSR 16 to achieve a secure hash table.Using ConcurrenThashMap, we can safely operate the hash table safely in a multi -threaded environment and do not need to use the lock. By using Backport of JSR 16, we can enjoy the function of the new version of the Java class library on the old version of the Java platform, thereby improving the performance and scalability of the code.However, it should be noted that not all new features can introduce the old version of the Java platform through BackPort. Therefore, you need to read its documents carefully before using the Backport library to understand the specific support functions and restrictions.