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最新推荐文章于 2024-03-15 00:57:17 发布

ssyz1988

最新推荐文章于 2024-03-15 00:57:17 发布

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分类专栏： java 文章标签： reference compiler behavior output string class

本文链接：https://blog.youkuaiyun.com/ssyz1988/article/details/6832852

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本文通过实现Java中的青蛙类继承自两栖动物基类，并展示了多态特性，即通过基类引用调用子类特定方法。实例演示了如何在面向对象编程中利用继承和多态来增强代码的灵活性和可复用性。

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程序如下：

package reusing;

class Frog2 extends Amphibian {
public void moveInWater() {
System.out.println("Frog swimming");
}
public void moveOnLand() {
System.out.println("Frog jumping");
}
}

public class E17_Frog2 {
public static void main(String args[]) {
Amphibian a = new Frog2();
a.moveInWater();
a.moveOnLand();
}
} /* Output:
Frog swimming
Frog jumping

*///:~

基类Amphibian中也定义了moveInwater和moveOnland方法。

要点：Since the compiler has a reference to an Amphibian, you might guess it will call
the Amphibian methods. Instead, it calls the Frog2 methods. Since a is indeed
a reference to a Frog2, this is the appropriate result. That’s polymorphism: The
right behavior happens even if you are talking to a base-class reference.