Detailed explanation of the technical principles of Excalibur Collections framework in the Java class library

Excalibur Collections is a framework in the Java class library that provides some special set classes to enhance and expand the set framework in the Java standard library.The technical principles of the Excalibur Collections framework will be explained in detail in this article. The design goal of the Excalibur Collections framework is to provide more efficient and flexible data structures and optimization of common operations.It provides these advantages by optimizing internal data structures and algorithms, as well as additional functions and characteristics. The following will introduce some key technical principles of the Excalibur Collections framework: 1. Data structure optimization: The Excalibur Collections framework uses some special data structures to improve the performance of the collection class.For example, its HashMap implements the use of the Robin Hood algorithm to improve the processing efficiency of laidity conflicts.In addition, Excalibur Collections also provides the implementation of data structures such as Bloom Filter, Trie, and BitSet to support more efficient finding and filtering operations. 2. Memory optimization: Excalibur Collections framework is committed to reducing memory consumption and achieved this goal through some technical means.For example, its BitSet uses position compression, represents each bit as a bit, and uses corresponding bit operations to improve memory utilization.In addition, EXCALIBUR Collections also provides some cache mechanisms that optimize memory occupation, such as Officemap based on outer memory. 3. Equipment safety: The Excalibur Collections framework considers thread security issues in concurrent environments in design.It provides some thread -safe sets, such as ConcurrenThashMap and ConcurrentSet. These classes use technologies such as locks and CAS operations to ensure the consistency and security of multi -threaded access. 4. Garbage recycling optimization: The Excalibur Collections framework improves the efficiency of garbage recovery by reducing garbage generation and optimizing garbage recycling process.It uses some technical means, such as object pools and cache reuse to reduce the creation and destruction of temporary objects, thereby reducing pressure on garbage recychers. Now, let's take a look at a sample code that uses Excalibur Collections framework: First of all, we need to add the dependencies of the Excalibur Collections library.In the Maven project, the following dependencies can be added to the POM.XML file: <dependencies> <dependency> <groupId>org.apache.commons</groupId> <artifactId>excalibur-collections</artifactId> <version>1.1</version> </dependency> </dependencies> Next, we can use a special set class in the Excalibur Collection of the framework, such as HashMap optimized using the Robin Hood algorithm: import org.apache.commons.collections4.map.RobinHoodHashMap; public class Main { public static void main(String[] args) { // Create RobinhoodhashMap object RobinHoodHashMap<String, Integer> map = new RobinHoodHashMap<>(); // Add key value pair map.put("one", 1); map.put("two", 2); map.put("three", 3); // Get the value System.out.println (map.get ("two"); // Output: 2 } } The above code demonstrates how to use the RobinhoodhashMap class in the Excalibur Collection frame.This class uses the Robin Hood algorithm to solve the laid -line conflict, providing more efficient insertion and finding operations. Through the Excalibur Collections framework, we can obtain more efficient and flexible collection classes and some optimized features.Not only can improve the performance of the Java application, but also reduce memory consumption and garbage generation, thereby improving the overall efficiency of the system.It is hoped that this article will help understand the technical principles of Excalibur Collections.