what is the use of method hiding in java code example

Example: method hiding in java

class Demo{
   public static void demoMethod() {
      System.out.println("method of super class");
   }
}
public class Sample extends Demo {
   public static void demoMethod() {
      System.out.println("method of sub class");
   }
   public static void main(String args[] ) {
      Sample.demoMethod();
     Demo sm= new Sample();
     sm.demoMethod();
   }
}