The technical development principle of the Java class library GentyRef framework
The technical development principle of the Java class library Gentyref framework
Overview:
Gentyref is a Java class library framework, which provides a mechanism to obtain generic types when compiling.This enables more convenience to obtain generic information when writing generic code, thereby achieving more flexible and type secure coding.
Development principle:
The development principle of Gentyref framework is mainly based on Java reflex technology and generic programming. The following will be introduced in detail.
1. Java reflection technology:
Java reflection technology allows members, attributes and methods of Java class during runtime.Through reflection, you can obtain relevant information of the class, and create instances, call methods, etc. of the class.Gentyref framework makes full use of Java reflection technology to achieve the treatment of generic types.
2. Generation programming:
A generic type is an important feature in the Java language. It provides a ability to use a variety of different types of different types of different types when designing and encoding.By using generic types, strong type security and code reuse can be achieved.Gentyref frameworks are allowed to obtain generic type information dynamically when they write generic code when writing generic code.
3. The main component of the Gentyref framework:
In order to achieve the acquisition of generic types, the Gentyref framework is mainly composed of the following two components:
a. Gentyref: This class is the core of the Gentyref framework, which provides a series of practical static methods. Through these methods, you can obtain generic type information.For example, you can use the Gentyref method to obtain generic parameters of the interface implementation of a class.
b. TypeReference class: This class is a generic abstraction class that can inherit and specify the generic type by passing the generic parameters.It can obtain the generic type information of the subclass through the Java reflection mechanism.Developers can define a class -related class by inheriting the TypeReFERENCE class and passing generic parameters.
4. Use examples:
Below is an example of using the Gentyref framework to show how to obtain a generic type information of a certain class:
import com.github.shyiko.gentyref.TypeToken;
public class ExampleClass<T> {
private TypeToken<T> typeToken = new TypeToken<T>(getClass()) {};
public void printTypeInfo() {
System.out.println("Type of T: " + typeToken.getType());
}
}
public class Main {
public static void main(String[] args) {
ExampleClass<String> example = new ExampleClass<>();
example.printTypeInfo();
}
}
In the above example, ExampleClass is a generic class that obtains generic type information by inheriting the Typetoken class.In the main class, an ExampleClass <string> object is created, and the Printtypeinfo () method is used to output generic types.The output result will be "Type of T: Class Java.lang.string".
Through the above examples, it can be seen that the Gentyref framework provides a convenient and flexible way to obtain generic type information, and can be checked during compilation to improve the readability and security of the code.
Summarize:
Gentyref framework provides a mechanism to obtain generic information during compilation by combining Java reflex technology and generic programming.Its development principle is based on the dynamic processing of Java class and generic types, enabling developers to obtain type information more conveniently when writing generic code, thereby achieving more flexible and type secure coding.
