Learn from the Fest Reflection box in the Java class library

Fest Reflection is a powerful and easy -to -use tool in the Java class library to operate the attributes and methods of Java objects during runtime.It can help developers quickly and easily access and operate the internal state of the objects when writing and integrated testing, and improve the readability and maintenance of the test. Fest Reflection provides a set of simple and powerful APIs that can be used to obtain and set the method of the object, call object method, and access the internal state of the object.Through the convenient method provided by Fest Reflection, developers can avoid tedious reflex code and simplify the writing process of test code. Here are the main features of some Fest Reflections: 1. Get the attribute of the object: Fest Reflection supports the attribute value in the object of the object's field name or attribute name.With the help of Fest Reflection, you can easily obtain the attributes of private attributes or corresponding package access control. Person person = new Person("John", 25); String name = Reflection.field("name").ofType(String.class).in(person).get(); 2. Set the attributes of the object: Use Fest Reflection to easily modify the attribute values of the object. Even if these attributes are private or have package access control. Reflection.field("age").ofType(int.class).in(person).set(30); 3. Method of calling objects: Fest Reflection provides a simple way to call the object.For example, you can directly call a private method or the method of packaging control control. String result = Reflection.method("privateMethod").in(person).invoke(); 4. Internal status of access objects: Fest Reflection provides a powerful mechanism that can directly access the internal status of the object, such as private fields, private methods, etc.In this way, developers can write more accurate and accurate test code. Object innerObject = Reflection.method("getInnerObject").in(person).invoke(); Fest Reflection is a very practical tool that simplifies reflex operations for Java objects and provides convenient APIs, making test code easier to write and maintain.It is simple and clear, which is a powerful testing auxiliary tool for developers. Although Fest Reflection has become a very popular library, it should be noted that when using Fest Reflection, it should follow appropriate programming specifications and best practices to ensure the readability and maintenance of the code.At the same time, it is necessary to pay attention to Fest Reflection. It should only be used for testing purposes and should not be abused in the production environment.