Using the example of "Payroll System Using Polymorphism " to create the example of Animal, Dog, and Cat by using Polymorphism, and to use one loop to make the cat and dog "Jiao " one time!
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多态嘛，animal是父类，有一个方法jiao()，cat dog继承animal，然后循环调用父类的jiao()
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java中没有多重继承，只有接口可以变相的实现，
public interfece Animal{}
public class dog extends Animal{}
public class cat extend Animal{}