Stopping inheritance without using final

Question

Is there any other method of stopping inheritance of a class apart from declaring it as final or by declaring its constructor as private?

Answer 1

• Use final
• Use private constructors

• Use a comment:

  // do not inherit
  

• Use a javadoc comment

• Make every method final, so people can't override them

• Use a runtime check in the class constructor:

  if (this.getClass() != MyClass.class) {
      throw new RuntimeException("Subclasses not allowed");
  }