example03_inheritance.java

java课程设计教材上的程例题序代码

package example;

/* 测试继承、上转型对象、多态性 */

class Animal
{
	public void cry()
	{
		System.out.println("杂音...");
	}
}


class Dog extends Animal
{
	public void cry()
	{
		System.out.println("汪汪...");
	}
}


class Cat extends Animal
{
	public void cry()
	{
		System.out.println("喵喵...");
	}
}


public class Example03_Inheritance
{
	public static void main(String[] args)
	{
		Animal animal;
		
		if (Math.random() >= 0.5)
		{
			animal = new Cat();
			animal.cry();
		}
		else
		{
			animal = new Dog();
			animal.cry();
		}
	}
}