Simple example of Java reflection

Suppose you have the following classes:

Package com.test.reflect;

public class Person

{

private int age;

private String name;

Public Persion ()

{

}

Public persion (String name)

{

THIS.name = name;

}

Public Persion (String name,int Age)

{

This (name);

This.age = age;

}

public void SetName (String name)

{

THIS.name = name;

}

public void Setage (int.)

{

This.age = age;

}

@hide

public void SetAll (String name,int Age)

{

SetName (name);

Setage (age);

}

private int Getage ()

{

return age;

}

Public String GetName ()

{

return name;

}

}

Because Getage () and SetAll () are private methods and @hide annotations, normal objects cannot be called. In order to be able to use these two methods, it can be reflected by:

public class Reflectdemo

{

public static void Main (string[] args) throws Exception

{

Get class Reference

Class class = Class.forName ("com.test.reflect.Persion");

Instantiating a Person object

Persion persion = (persion) class.newinstance ();//persion parameterless constructor

Persion persion = (persion) class.newinstance ("Xiaoming", 20);

Get SetAll function

Method setAll = Class.getmethod ("SetAll", String.class,int.class);

Call the SetAll function

Setall.invoke (persion, "Xiaohong", 18);

Get Getage function

Method getage = Class.getmethod ("Getage");

Call the Getage function

int age = (int) getage.invoke (persion);

System.out.println ("Name:" +persion.getname () + "Age:" +age);

}

}

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Simple example of Java reflection