Analysis of the technical principles of the ObjNESIS framework in the Java class library
Objeneis is an open source Java library for instantiated objects.Its main purpose is to bypass the constructor of the Java object, and directly use the constructor to create objects.In this article, we will analyze the technical principles of the Objeners frame and how to use this framework in the Java code.
ObjenesIS's technical principle is to use the Java bytecode operation technology to instantly instance the object of the object.Under normal circumstances, we create a new instance by calling the constructor of the object.However, in some cases, the structure of the object is not available or not applicable.For example, when we use a framework or library, we may not be able to access the structure method of the object, or the parameters of the constructed method may not be available.At this time, Objeneis can help us instantiate the object without calling the constructor.
Below is a sample code that uses ObjinSis frameworks to create objects:
import org.objenesis.Objenesis;
import org.objenesis.ObjenesisStd;
public class Main {
public static void main(String[] args) {
Objenesis objenesis = new ObjenesisStd();
MyClass myObject = objenesis.newInstance(MyClass.class);
// Use myObject for other operations ...
}
}
class MyClass {
public MyClass() {
System.out.println ("Call the Construction Method");
}
}
In the above examples, we first introduced the `Objeneisis` and` Objenersstdud.We then created an object of `Objeneis.Next, we use the `newInstance` method to obtain an instance of a` MyClass` class in the `Objenesis` object.
Note that in this example, the `MyClass` class does not significantly provides a non -constructive method.However, through Objeneis, we can still successfully instantiate this class object.Run the above code, and you will find that the program outputs "Call the Construction Method".This is because Objnesis has successfully created a new example by directly operating the Java bytecode by operating the Java bytecode, which has successfully created a new instance.
In summary, Objeneis is an open source library for instantiated Java objects.Its technical principle is to bypass the constructor by using the Java bytecode operation to create the object directly.Through Objeneis, we can instantly instantiate the object when the constructor is unsuitable or unsuitable.This enables us to operate the Java object more flexibly and improve our development efficiency when using the framework or library.
