Reflection in Java Example

Reflection in Java Example :

            Reflection is most powerful concept. It is used to get classes and methods, interfaces, fields, constructors, annotations in the runtime. Even if dono what are classes and methods are available.

Reflection is language ability  to inspect and dynamically call the classes,methods,attrtitubes,etc at runtime.

Reflection in java is used to inspect and modify the structure at runtime behavior of applications.

Syntax for Reflection :

Method[] methods=myClass.class.getMethods();

 For(Method method :methods){

  System.out.println(“Method =”method.getName());

}

Examples for Reflection in classes :

1.Create the java Project in Eclipse

2.Create the java class called Reflection.java

Reflection.java :

package com.example.reflect;

public class Reflection {

     

       private int count=0;  

       public void result(){

             

              System.out.println("The reflection is used to get all methods and class in runtime");

       }

      

       public void printMethods(String name){

             

              System.out.println("this method is shows with one param"+name);

       }

      

       public void printIntMethod(int no){

             

              System.out.println("All methods in print methods are"+no);

             

       }

      

       public void getAllMethods(){

             

              System.out.println("This is to get all methods");

             

       }

       public void setMethod(int no){

              no=count;

              System.out.println("The reflection method is"+no);

             

       }

}

3. create the another class called  Example.java

Example.java :

package com.example.reflect; 

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

public class Example {

                        public static void main(String[] args) {

                       Method[] method = Reflection.class.getDeclaredMethods();

                       Reflection rf = new Reflection();

                                //printing all the methods from the another class durning runtime

                                System.out.println("start");

                                for (Method me : method) {

                                                System.out.println("The methods are \t" + me);

                                }Method[] mMethod=rf.getClass().getMethods();

                                //calling the refelection method

                                try {

                                                System.out.println("here only calling method will print");

                                                mMethod[0].invoke(rf, null);

                                                System.out.println("Ending method is as follows");

                                } catch (IllegalAccessException e) {

                                                // TODO Auto-generated catch block

                                                e.printStackTrace();

                                } catch (IllegalArgumentException e) {

                                                // TODO Auto-generated catch block

                                                e.printStackTrace();

                                } catch (InvocationTargetException e) {

                                                // TODO Auto-generated catch block

                                                e.printStackTrace();

                                }

                System.out.println("Exit")

} }

4.Run the application and check the output