Java reflection mechanism example code analysis

1. Reflection mechanism definition

Java reflection mechanism is to obtain the structure of any class, create objects, get methods, execute methods, and attributes in the running state; this kind of The function of dynamically obtaining information in the running state and dynamically calling object methods is called the reflection mechanism of the Java language.

2. The running process of the reflection mechanism

When a Java program is running, the Java runtime system always performs so-called runtime type identification on all objects. This information records the class to which each object belongs. Virtual machines usually use runtime type information to select the correct method for execution. The class used to save this type information is the Class class.

3. There are three ways to obtain the Class object

// 1.通过字符串获取Class对象，这个字符串必须带上完整路径名 
Class studentClass = Class.forName("com.test.reflection.Student"); 
// 2.通过类的class属性 
Class studentClass2 = Student.class; 
// 3.通过对象的getClass()函数
 Student studentObject = new Student(); 
 Class studentClass3 = studentObject.getClass();

The first method is to obtain the Class object through the full path string of the class, which is also the most commonly used method. Reflection method to obtain the Class object;

The second method has restrictions: the package of the class needs to be imported;

The third method already has the Student object and no longer needs reflection.

The Class objects obtained through these three methods are the same, which means that when Java is running, only one Class object will be generated for each class.

What is Java

Java is an object-oriented programming language that can write desktop applications, Web applications, distributed systems and embedded system applications.

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