Example of the use of the Caffeine Cache framework in the Java class library

Example: In the Java class library, Caffeine Cache is a powerful cache framework to improve the performance and response speed of the application.It avoids frequent disk or database access by storing data in memory, thereby speeding up the speed of data retrieval.Below is a simple example, showing how to use the Caffeine Cache framework. First, you need to add the dependency item of the Caffeine library to your project.You can add the following dependencies to Maven or Gradle Construction Tools: <!-- Maven --> <dependency> <groupId>com.github.ben-manes.caffeine</groupId> <artifactId>caffeine</artifactId> <version>2.9.0</version> </dependency> // Gradle implementation 'com.github.ben-manes.caffeine:caffeine:2.9.0' Next, you need to create a Caffeine Cache instance.You can create by using the static method in the Caffeine class. import com.github.benmanes.caffeine.cache.Cache; import com.github.benmanes.caffeine.cache.Caffeine; public class CaffeineExample { public static void main(String[] args) { // Create Caffeine Cache example Cache<String, String> cache = Caffeine.newBuilder().build(); // Add data to the cache cache.put("key1", "value1"); cache.put("key2", "value2"); // Obtain data from the cache String value1 = cache.getIfPresent("key1"); String value2 = cache.getIfPresent("key2"); System.out.println (value1); // Output: Value1 System.out.println (Value2); // Output: Value2 } } In the above example, we first created a Caffeine Cache instance.Then, we use the `put` method to add the data to the cache, and each data has a unique key.Next, we use the `GetifPreSent` method to retrieve data from the cache.If the data exists in the cache, the value of the data is returned; otherwise NULL is returned. Caffeine Cache also provides other useful functions, such as setting the maximum size of the cache, the expiration time of the cache, etc.You can configure Caffeine Cache according to your needs. In short, Caffeine Cache is a powerful Java cache framework that can significantly improve the performance and response speed of the application.By using Caffeine Cache, you can reduce the frequency of external resource access and avoid repeated data loading, thereby improving the user experience of the application.