Prevent a class from being extended

 

  • A class with the final qualifier cannot be extended (i.e., used as a superclass): 

    /* ======================================
   This class cannot be extended
   ====================================== */
public final class myClass 
{

   // Data fields, constructors, and methods omitted



}

DEMO: demo/04-inheritance/23-final-class

Prevent a inherited method from being overridden

 

  • A method with the final qualifier cannot be overridden in a subclass: 

    public  class myClass 
{
    ....

    /* ======================================
       This method cannot be overridden
       ====================================== */
    public final void method1()
    {
        // Do something
    }

    ....
}

DEMO: demo/04-inheritance/23-final-method