Example of Java inheritance that overrides a baseclass's behavior

gistfile1.java

import java.util.*;
import java.lang.*;
import java.io.*;

class Human {
  public Human() {}
  public void walk() {
    this.moveFeet();
  }
  public void moveFeet() {
    System.out.println("Human.moveFeet");
  }
}

class Dork extends Human {
  public Dork() {}
  public void moveFeet() {
    System.out.println("Dork.moveFeet");
  }
}

class Main
{
  public static void main (String[] args) throws java.lang.Exception
  {
    Dork d = new Dork();
    d.walk(); // Dork.moveFeet
    Human h = new Dork();
    h.walk(); // Dork.moveFeet
  }
}