java - Why can you not inherit from a class whose constructor is private? -

why java disallow inheritance class constructor private?

java doesn't prevent sub-classing of class private constructors.

public class main {     static class {         private a() {             system.out.println("subclassed in "+getclass().getname());         }     }      static class b extends {         public b() {          }     }      public static void main(string... ignored) {         new b();     } } 

prints

subclassed in main$b 

what prevents sub-classes cannot access constructors of super class. means private constructor cannot used in class file, , package local constructor cannot used in package.

in situation, option have delegation. need call factory method create instance of "super" class , wrap it.