Designing Packages with Javadoc comments in Java

/* File name : Animal.java */
package animals;

interface Animal {
   public void eat();
   public void travel();
}

Now put an implementation in the same package animals:

package animals;

/* File name : MammalInt.java */
public class MammalInt implements Animal{

   public void eat(){
      System.out.println("Mammal eats");
   }

   public void travel(){
      System.out.println("Mammal travels");
   } 

   public int noOfLegs(){
      return 0;
   }

   public static void main(String args[]){
      MammalInt m = new MammalInt();
      m.eat();
      m.travel();
   }
}