Analysis and research on the technical principles of Solong Collections in Java Library
Analysis and research on the technical principles of Solong Collections in Java Library
Overview:
Solong Collections is a Java -based open source framework, which aims to provide an efficient collection data structure implementation method.The principle rely on the generic, reflection, and dynamic proxy of the Java language, so that developers can flexibly define various collection types, and dynamically generate the corresponding collection implementation classes at runtime, thereby improving the operating efficiency of the code.
principle:
The main principles of the Solong Collections framework include the following aspects:
1. Generation: Java's generic mechanism allows us to specify the type of the collection element during compilation.Solong Collections use generic types to achieve the type of setting of the set and can obtain generic information at runtime.
2. Reflex: Java's reflection mechanism allows us to dynamically obtain the class information at runtime, and call the method of class and access class attributes.Solong Collections can obtain the collection type information at runtime with the reflection mechanism, and dynamically generate the corresponding set implementation class as required.
3. Dynamic proxy: Java's dynamic agency mechanism allows us to create an agent object that implements a given interface at runtime.Solong Collections uses a dynamic agent to achieve customized implementation of the collection interface.When running, it dynamically generates a proxy class according to the collection type information defined by the user. The proxy class realizes the required set interface and entrusts the actual set operation to the specific collection implementation class.
4. Collection Implementation Class Generation: Solong Collections framework Based on the collection type information defined by the user, the dynamic code generation technology is generated to dynamically generate a specific set of sets of the collection interface during runtime.These generated set implementation classes are generated by the Java bytecode operating library, which can ensure that the generated classes and handwriting set implementation classes have the same performance.
Code example:
In order to better understand the principle of Solong Collections, let's look at a sample code and show how to use the Solong Collections framework to create a customized collection type:
public interface MyList<E> {
void add(E element);
E get(int index);
int size();
}
public class MyListImpl<E> implements MyList<E> {
private List<E> list = new ArrayList<>();
@Override
public void add(E element) {
list.add(element);
}
@Override
public E get(int index) {
return list.get(index);
}
@Override
public int size() {
return list.size();
}
}
public class Main {
public static void main(String[] args) {
MyList<String> myList = SoLongCollections.create(MyList.class, ArrayList.class);
myList.add("Hello");
myList.add("World");
System.out.println(myList.get(0)); // Output: Hello
System.out.println(myList.size()); // Output: 2
}
}
In the above example, we define a custom set interface `myList`, which contains methods to add elements, obtain elements, and obtain a collection size.We have implemented a specific collection class `myListimpl`, and use the Java standard library's` ArrayList` to be realized as actual collection.
In the `Main` method of the` Main` class, we use the `SOLONGCOLLECTIONS.CREATE` method to create an instance of` myList`, specifying the actual collection of implementation classes as `arrayList`.Then, we can use the `MyList` object to operate like an ordinary collection object.
Summarize:
Solong Collections frameworks can easily define and use custom efficient set data structures by using Java language's generic, reflection, and dynamic proxy.Through dynamic code generation technology, it dynamically generates the specific set of sets of the collection interface during runtime, thereby improving the operating efficiency of the code.Hope this article is helpful for understanding the technical principles of understanding the Solong Collections framework.
