Three ways to get a class object

1: Obtained through the method getclass that each object has. Cons: You must create the class object before you can call the GetClass method.

2: Each data type (basic data type and reference data type) has a static property class. Cons: This class must be identified first.

The first two methods are not conducive to the extension of the program, because it is necessary to use a specific class to complete the program.

3: The method used in class, the static Forname method .

Specifies what class name to get what class bytecode file object, this way is strongest, as long as the class name of the string passed in.

//1. obtained for class loading based on the given class name

String classname = "Cn.itcast.reflect.Person";//From configuration file

Class clazz = class.forname (classname);//This object represents Person.class

//2. If you get the object, don't know what type is used to get the object type

Object obj = new person ();

Class clazz1 = Obj.getclass ();//Get the object specific type

//3. If you are explicitly getting a class object that is used primarily to pass a reference

Class clazz2 = Person.class;

Three ways to get a class object