Call a base function on the all the implementations of an interface. [duplicate]

This question already has an answer here:

• Find Java classes implementing an interface [duplicate] 9 answers

What is the best way to call a base function on all the implementations of an interface with reflection and fewer lines possible.

public interface BaseClass { public void doSomething();}

public class A implements BaseClass { 
     @Override
     public void doSomething () {
         System.out.println("doing Something in A"); 
     }
}

public class B implements BaseClass { 
     @Override
     public void doSomething () {
         System.out.println("doing Something in B"); 
     }
}

public class anotherClass {
    public static void main(final String[] args) {
       // get all the implementations of BaseClass;
       // for each implementation call doSomething();
    }
}