High -efficiency programming technique based on Fest Reflection in the Java class library
Use Fest Reflection to perform efficient programming Java -class library skills
Overview:
Fest Reflection is a Java class library that provides a set of powerful and efficient API for the fields, methods and constructors of the Java objects during runtime.By using Fest Reflection, developers can more easily reflect operations while improving the readability and maintenance of code.This article will introduce how to use Fest Reflection for efficient programming and provide some Java code examples.
1. Introduce the Fest Reflection Library
First, you need to introduce the Fest Reflection library in the project.It can be implemented by adding the following Maven dependency to the pom.xml file of the project:
<dependency>
<groupId>org.easytesting</groupId>
<artifactId>fest-reflect</artifactId>
<version>1.4.1</version>
</dependency>
2. Visit and modify the fields of the object
With Fest Reflection, we can easily access and modify the fields of the Java object.Suppose we have a class called Person, which contains various attributes.The following is an example code that shows how to use Fest Reflection to access and modify the field of the Person object:
import org.fest.reflect.core.Reflection;
public class Main {
public static void main(String[] args) {
Person person = new Person();
String fieldName = "name";
Reflection.field(fieldName).ofType(String.class).in(person).set("John Doe");
String fieldValue = Reflection.field(fieldName).ofType(String.class).in(person).get();
System.out.println (FieldValue); // Output: John Doe
}
}
class Person {
private String name;
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
In the above example, we specify the field names to be visited using Reflection.field (Fieldname) method, and specify the type of field through the Office (String.class).Then, the IN (Person) method specifies the objects to be operated, and use the set () and get () methods to modify and access the field.
3. The method of calling the object
Fest Reflection also allows us to easily call Java objects.Below is a sample code that shows how to call the Person class with Fest Reflection:
import org.fest.reflect.core.Reflection;
public class Main {
public static void main(String[] args) {
Person person = new Person();
Reflection.method("setName").withParameterTypes(String.class).in(person).invoke("John Doe");
String name = Reflection.method("getName").withoutParameters().in(person).invoke();
System.out.println (name); // Output: John Doe
}
}
class Person {
private String name;
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
In the above example, we specify the method name to be called using the Reflection.Method ("MethodName") method to specify the method name to be called, and specify the parameter type of the method through the Withparameterpes () and Withoutparameters () method.Then, the object to call the method is specified through the (Person) method, and the actual call method is used to use the Invoke () method.
Summarize:
Using Fest Reflection can help us more easily perform reflex operations of Java objects.Whether it is the field of access and modification objects, or the method of calling the object, Fest Reflection provides simple and efficient APIs.By introducing the Fest Reflection library in the project and following the above example code, we can achieve efficient reflex programming in the Java program.I hope this article will help you!
