How to get objects using java reflection

1. Use the object to call the getClass method of Object

Method to obtain the bytecode object: To use this method, you must clarify the specific category and create the object.

public static void getClassObject_1() {
 
Person p = new Person();
Class<?> clazz = p.getClass();
 
Person p1 = new Person();
Class<?> clazz1 = p1.getClass();
 
System.out.println(clazz == clazz1);
}

2、Calling properties

Any data type has static properties. class can obtain the corresponding class object. Relatively simple, but explicitly use static members in the class.

public static void getClassObject_2() {
 
Class<?> clazz = Person.class;
 
Class<?> clazz1 = Person.class;
System.out.println(clazz == clazz1);//true都是Person类的字节码
}

3. Using the forName() method

can be obtained by the string name of a given category, and can be more expanded. But it is done in Class class. This method is forName. This method only needs a name, which is more convenient and extensible.

public static void getClassObject_3() throws ClassNotFoundException {
 
String className = "com.ldb.po.Person";
 
Class<?> clazz = Class.forName(className);
 
System.out.println(clazz);
}

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