12.6 Calling Private Method in Java Class using Reflection API

If we want to know behavior of the class, interface of a class file, manipulation classes, fields, methods, and constructors then we can use reflection API concept of java.

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[aymanpatel]

Do not use Reflection API unless you work on frameworks like Spring or libraries like Hibernate, Junit .etc.
Why not reflection?
1. It violates type-safety
2. Using it to invoke private methods violates encapsulation and security guarantees.
3. Since it is violates type-safety, it makes it exponentially harder to debug.

[singh]

Right way would be with generic: and we don't need to put null:---

Class<?> c =
Test t =(Test)c.newInstance();
Method m= c.getDeclaredMethod("show");
m.setAccessible(true);
m.invoke(t);

[aiswaryasekar]

Hi Naveen,
On using reflection, private variables can be accessed. Then how can we acheive data abstraction?
Is there any other way to make a variable inaccessible even by reflection ?
Kindly illustrate.

[ashokaj]

Absolutely we need whole playlist on reflection

[Just_Bunny_life]

Sir please make videos audible enough, so that they are easily understandable....

[chaitanyatuckley]

Sir what to do if the method os parameterised? How to declare it in the main function?

[lohithdonthamshetti]

Is there any particular reason creating the object by using the class function

[dineshsatpute]

Hello Naveen
my private method accept ArrayList(Person) as argument
so how can I write reflection for the same
please give me answer on priority

[tedtdu]

Class.forName();
c.newInstnce();
both returns object of Class Test, right?
What is defference then.

[hrishikesh]

Hello Navin sir, could you please re-upload this video with increased volume of audio.watching java playlist best tutorials, simple but effective...thank you

[narenraj]

How to invoke method if one of the parameters of the method is an interface ? Keep getting nosuchmethod exception

[prakashtechshot]

Can we pass parameters to private method from reflex api ? Tell me how to pass

[praveensirugudi]

Hi Naveen, Could you please create a playlist for reflection concepts and share them.
Nice Tutorials, easily understandable

[soumikchoudhury]

Wrote the same exact code, but console shows class not found exception. Any ideas? (Anyone who sees this comment)

[sunnymaurya]

The another application of reflection api is it is used in various coding platform like hackerank, codechef, to run the test cases.

[mukeshsinghdance]

He says, reflection is not being used in real time. it used for only debugging. Spring uses so much of reflection. spring can't exist without relfection. Please give correct information.

[jatinderverma]

Why this concept introduced? What is the need where it can be used?

[tanaysamanta]

//java 15.0.1 2020-10-20
// Access Private Method Using Reflection in Java

import java.lang.reflect.Method;
class College {

public static void main(String[] args) throws Exception
{
// Student class object
Student e = new Student();

// Create Method object
Method m =

// Set the accessibility as true
m.setAccessible(true);

m.invoke(e);
}
}
// Student class declaration
class Student {
private void printName() { System.out.println("Tanay"); }
}