JAVA-内部类实现接口并实例化

interface Animal
{
	void eat();
	void sleep();
}
class Zoo
{
	private class Tiger implements Animal
	{
		public void eat()
		{
			System.out.println("T eat");
 
		}
		public void sleep()
		{
			System.out.println("T sleep");
		}
	}
	Animal getAnimal()
	{
		return new Tiger();
	}
}
class Test
{
	public static void main(String[] args)
	{
		Zoo z=new Zoo();
		Animal an=z.getAnimal();
		an.eat();
		an.sleep();
	}
}