EXCALIBUR Collections Framework in the Java Class Library Analysis and Technical Principles
EXCALIBUR Collections Framework in the Java Class Library Analysis and Technical Principles
introduce:
Excalibur Collections is an open source Java class library that provides developers with a set of powerful collection classes and related tools to simplify the operation of using collection in Java applications.This article will analyze the design ideas and technical principles of the Excalibur Collection frame.
1. Design thought:
The design ideas of the Excalibur Collections framework mainly include the following aspects:
1.1 separation interface and implementation:
The Excalibur Collections framework adopts the design pattern of interface and separation.Through the interface, developers can easily define the behavior and operation of the set class, and switch and replace between different implementation classes.The advantage of this is that it can improve the flexibility and maintenance of code.
1.2 Dreatment of exception:
The Excalibur Collections framework focuses on abnormal processing in design.By defining specific abnormal types in the interface, developers can better handle abnormalities that may occur during the operation of the collection class.This makes the code more robust and reliable.
1.3 Combined:
The Excalibur Collections framework provides a set of combined collection classes that allow developers to combine and split freely according to actual needs.This combined help developers can build a more flexible and efficient collection structure.
2. Technical principle:
The implementation of the Excalibur Collections framework depends on the following basic technical principles:
2.1 Compound better than inheritance:
The Excalibur Collections framework uses the principle of composite better than inheritance to achieve the relationship between different set classes.By combining and commissioning, different sets are combined into more complex and powerful collection structures, and at the same time, it also maintains the scalability and maintenance of the code.
2.2 Generation:
EXCALIBUR Collections framework widely uses generics to enhance the type of security and readability of code.By using generic parameters in the collection interface and implementation class, developers can capture type errors during compilation and avoid type conversion operations displayed.
2.3 iterator mode:
The set classes in the Excalibur Collections framework all realize the iterator mode, so that developers can access the set elements by iterations one by one.This design mode not only simplifies the writing of code, but also provides traversing and filtering functions of the collection elements.
Below is a simple sample code that uses Excalibur Collections framework:
import com.google.collections.Lists;
import java.util.List;
public class ExcaliburCollectionsExample {
public static void main(String[] args) {
// Create a variable length list
List<Integer> list = Lists.newArrayList(1, 2, 3, 4, 5);
// Traversing the list and printing each element
for (Integer num : list) {
System.out.println(num);
}
}
}
The above code shows how to use the `Lists` class in the Excalibur Collection of EXCALIBUR Collection to create a variable -length list and use each element in the printing list with iterators.
Summarize:
The design ideas and technical principles of the Excalibur Collections framework in the Java library make it a powerful and flexible set of libraries.Through the design ideas such as abstract interface and implementation of separation, abnormal processing, and combined ability, as well as technical principles such as composite inheritance, generic, and iterators mode, the EXCALIBUR CollectionS framework provides rich collection and related tools, which greatly simplifies the great simplificationDevelopers use a collection operation in Java applications.
