Animal.java

public class Animal {

	private String name;

	public Animal(String name) {
		this.name = name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getName() {
		return name;
	}

	public void speak() {
		System.out.println("My name is " + getName() + " and I am an Animal");
	}

}

AnimalTest.java

public class AnimalTest {

	public static void main(String[] args) {
		Animal animal = new Animal("Joe");
		Fox fox = new Fox("Steve");
		Cat cat = new Cat();

		animal.speak();
		fox.speak();
		cat.speak();
	}

}

Cat.java

public class Cat extends Animal {

	public Cat() {
		// every cat is named max
		super("Max");
	}

	@Override
	public void speak() {
		System.out.println("My name is " + getName() + " and I meow meow moew");
	}
}

Fox.java

public class Fox extends Animal {

	public Fox(String name) {
		super(name);
	}

	@Override
	public void speak() {
		System.out.println("My name is " + getName() + " and I say: Ringalinga dinga dinga ding ding ");
	}

}