Overriding and Hiding Methods

最新推荐文章于 2023-09-11 13:41:11 发布

micro9981

最新推荐文章于 2023-09-11 13:41:11 发布

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本文链接：https://blog.youkuaiyun.com/micro9981/article/details/82187771

本文探讨了Java中方法覆盖与方法隐藏的概念及其差异。通过具体的Animal和Cat类实例演示了如何实现这两种行为，并展示了不同调用方式下方法执行的变化。

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Instance Methods can be overrided, see override in java

If a subclass defines a class method with the same signature as a class method in the superclass, the method in the subclass hides the one in the superclass.

The distinction between hiding and overriding has important implications. The version of the overridden method that gets invoked is the one in the subclass. The version of the hidden method that gets invoked depends on whether it is invoked from the superclass or the subclass.

Animal.java

public class Animal {    public static void testClassMethod() {        System.out.println("The class" + " method in Animal.");    }    public void testInstanceMethod() {        System.out.println("The instance " + " method in Animal.");    }}

Cat.java

public class Cat extends Animal {    public static void testClassMethod() {        System.out.println("The class method" + " in Cat.");    }    public void testInstanceMethod() {        System.out.println("The instance method" + " in Cat.");    }     public static void main(String[] args) {        Cat myCat = new Cat();        Animal myAnimal = myCat;        Animal.testClassMethod();        myAnimal.testInstanceMethod();                System.out.println("\n another style\n");       Cat.testClassMethod();       myAnimal.testClassMethod();       myCat.testClassMethod();       myCat.testInstanceMethod();    }}

output

The class method in Animal.The instance method in Cat.  another style The class method in Cat.The class method in Animal.The class method in Cat.The instance method in Cat.