June 14, 2002 - Using override | WebReference

June 14, 2002 - Using override

Yehuda Shiran June 14, 2002
Using override
Tips: June 2002

Yehuda Shiran, Ph.D.
Doc JavaScript

Let's look at an example that demonstrates the override behavior. The class FirstBase has two methods: pitcher() and hitter(), each printing a unique message:

class FirstBase {
    function pitcher() { print("I am a pitcher on first base"); }
    function hitter() { print("I am a hitter on first base"); }
  }
Let's define a derived class now. It redefines both the pitcher() and the hitter() methods. The pitcher() method will be marked as hide, and the hitter() function will be marked as override:

  class SecondBase extends FirstBase {
    hide     function pitcher() { print("I am a pitcher on second base"); }
    override function hitter() { print("I am a hitter on second base"); }
  }
Let's create an instance of the derived class, SecondBase: 

  player : SecondBase = new SecondBase;
and call his pitcher() and hitter() methods:

  player.pitcher();
  player.hitter();
The output should reflect the default of overriding the base methods:

  I am a pitcher on second base
  I am a hitter on second base
To learn more about JScript .NET, go to Column 110, JScript .NET, Part IV: Inheritance.