Java Advanced Reflection: Reflection basics How to get a class and how to get all the properties and methods of this class (1)

After some time in Java learning, you may often hear the word reflex, which means that Java has learned a higher level. Next, I'll take a step-by-step with you to uncover the mysteries of Java's advanced features reflection.

The concept of the following class object is introduced first, and may often be used in this concept:

　　　　class object : Java has a very classic words, "Everything is the object", I believe we are not unfamiliar, this sentence tells us one of the characteristics of Java, that is object-oriented. We are all familiar with the concept of classes in Java, since everything is an object, so who is the object of the class? < The concept of an object: an instance of a class > In other words, whose instance the class is. So there is the concept of class object. In Java there is a class whose name is class, and any class is an object of this class.

Here's a few lines of code to show you how to get a class object:

1. Create a new package Com.cx.bean, creating a class book under the package

Book.java file

 PackageCom.cx.bean; Public classBook {Private intID; PrivateString name; PrivateString type;  Public intgetId () {returnID; }     Public voidSetId (intID) { This. ID =ID; }     PublicString GetName () {returnname; }     Public voidsetName (String name) { This. Name =name; }     PublicString GetType () {returntype; }     Public voidsetType (String type) { This. Type =type; }}

1. Create a new package Com.cx.main, creating a class test under the package.

Test.java file

 PackageCom.cx.main;
ImportCom.cx.bean.Book; Public classTest { Public Static voidMain (string[] args) {Class C1=NULL; Class C2=NULL; Class C3=NULL;/*** Get Class object: Class object itself is a class*/        //The first way: the Static forname () method parameter of the class object is the complete classpath name        Try{C1= Class.forName ("Com.cx.bean.Book"); } Catch(ClassNotFoundException e) {e.printstacktrace (); } System.out.println ("The first Kind:" +C1);//: Class Com.cx.bean.Book//the second way: Get the Class object through the GetClass () method of the class instanceBook bo=NewBook (); Object ob=o; System.out.println ("Second type:" +Ob.getclass ()); //The third type: class name.C3=book.class; System.out.println ("Third type:" +C3); }}
/**
Operation Result:
　　

First type: Class Com.cx.bean.Book
The second type: Class Com.cx.bean.Book
The third type: Class Com.cx.bean.Book

This code allows you to clearly show how to get a class object.

*/

Java Advanced Reflection: How the Reflection base gets a class and how to get all the properties and methods of the class (1)