Java constructor having broader access level than its class

Question

Java specification allows a class with default access to have its constructor public access, what is the purpose of it, since it cannot be referenced outside its package?

Answer 1

I wanted to make this a comment, but since no code tags are allowed in comments....

In regards to your comment on CristopheDs answer:

package bob;

class MySuperHiddenClass {

  public MySuperHiddenClass() {
        System.out.println("bob");
  }
}

And

package bob;
public class MyPublicClass extends MySuperHiddenClass {

}

No constructor was declared in MyPublicClass, but you can still call new MyPublicClass from any package.

Answer 2

If you are asking for why you can have public constructors: it's because you can for example call them explicitely (or implicitely) when you extend a base class.