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This article mainly explains "what is the upward transformation of java polymorphism". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn what the upward transformation of java polymorphism means.

Description

1. Upward transformation is to reference a subclass to a parent class reference, that is, the parent class reference refers to the object of the subclass.

2. The format is parent class object = subclass instance.

At this point, the method called through the parent class reference variable is that the subclass overrides or inherits the parent class's method, not the parent class's method. However, the property called is still the property of the parent class.

Example

Class Animal {public String name; public void eat () {System.out.println (this.name + "eating");}} class Cat extends Animal {} public class Test extends TestDemo {public static void main (String [] args) {/ / parent class reference refers to the object referenced by the child class reference Cat cat = new Cat (); Animal animal = cat / / upward transition}} Thank you for your reading. The above is the content of "what is the upward transformation of java polymorphism". After the study of this article, I believe you have a deeper understanding of what the upward transformation of java polymorphism refers to, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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