How to resolve 'Implicit super constructor classA() is not visible. Must explicitly invoke another constructor'?

Question

I am having a class \'ClassA\' which is having private constructor.

public final class ClassA{
  private ClassA{
  }

  public static void main(String[] arg)         


        

Answer 1

I would suggest composition instead of inheritance (maybe that's what the designer of ClassA intended for class usage. Example:

public class ClassB {
   private ClassA classA;

   ClassB() {
       // init classA
       ...
   }

   public ClassA asClassA() {
       return classA;
   }

   // other methods and members for ClassB extension
}

You can delegate methods from ClassB to ClassA or override them.