Java Reflection NoSuchMethod exception when assigning implemented class to interface

Question

Java Reflection

I have interface as following

public Interface A { void print();}

Inteface implementation as following

public class B implements A {

int abc =0;
public void setAbc(int abc){this.abc=abc;}
public int getAbc(return this.abc;);

void print(){
System.out.println("Hello world");
}

}

Now i assign child into interface as following

A a = new B();

using reflection i am trying to access child from parent as following

Class clazz = a.getClass()
clazz.getField("abc").set(a, new Integer(1456));

but i found no such method exception

any quick help ? i am assinging child into parent b/ci have multiple implementations which contains different properties..

Answer 1

The getField() method will only find the field if it's public . You can use the getDeclaredField method, which will find the field if it's declared directly on the class, whether it's public or not.

When you say getClass() , you will get the runtime Class (here, B ), even if the variable a is typed as the interface A .

Answer 2

Field[] declaredFields = dtoKlass.getDeclaredFields();

Do Something like this. I use getDeclaredField() to do what you're trying to achieve.