'EXCALIBUR Collection' framework technical principles in the Java Class Library
Excalibur Collections framework is an important technology in the Java class library, which aims to provide more efficient and easier to use a collection class.This article will analyze the technical principles of the Excalibur Collections framework and provide some related Java code examples.
The design goal of the Excalibur Collections framework is to optimize the operation of the collection class by reducing memory occupation and improving performance.This goal is achieved by optimization in the following aspects:
1. Compressed storage: Excalibur Collections framework uses a data structure called Roaring Bitmaps to compress the storage integer set.Roaring Bitmaps uses a combination of drawings and array, which can efficiently store and operate large -scale integer sets.This storage method can effectively reduce memory consumption, especially suitable for storing a large number of repeated integers.
The following is an example code that uses Excalibur Collections to store integer sets:
import org.excalibur.collections.RoaringBitmap;
public class RoaringBitmapExample {
public static void main(String[] args) {
RoaringBitmap bitmap = new RoaringBitmap();
// Add an integer in place diagram
bitmap.add(10);
bitmap.add(20);
bitmap.add(30);
// The integer in the traversing position diagram
for (int num : bitmap) {
System.out.println(num);
}
}
}
2. Parallel operation: EXCALIBUR Collection ’s framework also supports concurrent operations, which can safely use the set class in a multi -threaded environment.By using thread security data structure and lock mechanism, it ensures the data consistency and thread security during multi -threaded access access.
The following is an example code for concurrent operations using the Excalibur Collections framework:
import org.excalibur.collections.ConcurrentHashSet;
public class ConcurrentHashSetExample {
public static void main(String[] args) {
ConcurrentHashSet<String> set = new ConcurrentHashSet<>();
// Operate HashSet in multi -threaded
Thread thread1 = new Thread(() -> {
set.add("A");
set.add("B");
});
Thread thread2 = new Thread(() -> {
set.add("C");
set.add("D");
});
thread1.start();
thread2.start();
try {
thread1.join();
thread2.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
// Traversing elements in HashSet
for (String str : set) {
System.out.println(str);
}
}
}
3. Memory optimization: EXCALIBUR Collections framework also provides some features for optimizing memory occupation.For example, it uses the original type of array to replace the packaging type array to reduce the overhead of automatic boxing and boxing.In addition, it also uses compressed pointer technology to reduce the memory space occupied.
These technical optimizations of the EXCALIBUR Collections framework make the Java set class more efficient and easy to use.It has an advantage in processing large -scale data and concurrency access, and is one of the indispensable frameworks in the development of Java.
The above is the analysis of the technical principles of the Excalibur Collections framework. It also provides some related Java code examples.It is hoped that this article can help readers understand the working principle of the Excalibur Collection frame and apply these technologies to optimize these technologies in actual development.
