public class MammalMain
{

    public static void main(String[] args)
    {
	Mammal[] mammals = new Mammal[4];
	mammals[0] = new Dolphin();
	mammals[1] = new Platypus();
	mammals[2] = new Human();
	mammals[3] = new CSStudent();
	
	for (Mammal m : mammals)
	{
	    System.out.print("Generally, a " + m.getName());
	    System.out.print( m.laysEggs() ? " lays eggs " : " gives live birth ");
	    System.out.print(" and can be found ");
	    System.out.print( m.livesInWater() ? "in water " : " on land");
	    System.out.print(" saying ");
	    m.speak();
	    System.out.print("\n");;
	}
    }

}