parent reference to child object in java

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Java study note 12 --- parent class Object Reference pointing to Child class object, learning Note 12 ---

Java study note 12 --- parent class Object Reference pointing to Child class object, learning Note 12 --- What happens when the object reference of the parent class does not point to the object of the parent class, but to the object of the subclass?

Learn more about parent class references pointing to child classes, and learn more about references pointing

Learn more about parent class references pointing to child classes, and learn more about references pointing The parent class application points to a subclass object and refers: The parent class Animal, subclass Cat, Dog. Here, Animal can be an

Review and summary of Java Fundamentals < One > (2) Parent class reference to child class object (up, dynamic link)

Public class Animal {Public static void Main (string[] args) {Animal Animal = new Cat ();Animal.voice ();Drinkwater (animal); Call a static method, passing in a subclass object referenced by the parent class }String str;Public void Voice ()

Java Tour (vi)--single case design pattern, inheritance extends, aggregation relationship, child parent class variable relationship, Super, overlay

Java Tour (vi)--single case design pattern, inheritance extends, aggregation relationship, child parent class variable relationship, Super, overlay Java also more and more deep, everyone refueling it! Let's take a step I. Single-CASE

Java polymorphism, how to understand parent class references to child class objects

ExtractJava polymorphism, how to understand parent class references to child class objectsTo understand polymorphism, you first need to know what is "upward transformation".I defined a subclass cat, which inherits the animal class, and the latter is

Understanding parent class references to child class objects

Java polymorphism, how to understand parent class references to child class objectsTo understand polymorphism, you first need to know what is "upward transformation".I defined a subclass cat, which inherits the animal class, and the latter is the

member variables and functions in the child parent class of Java inheritance

Member variables:First look at this piece of code:The parent class. Class Fu{int num = 3;} Class Zi extends Fu{int num = 4;void Show () {System.out.println ("num =" +this.num);}} Class Extendsdemo {public static void main (string[] args) {Zi z = new

Preliminary understanding of java--eighth-inheritance-member functions in child-parent classes-Overrides

One.Talk about the completion variables and start talking about the characteristics of the member functions in the child parent class. (also review the differences between the different functions, and why is there such a difference?) )Subclasses

Inheritance in java: relationships between parent and child classes

When a parent class reference is directed to a child class object1, the Kawai class overrides a method, the parent class references a new method that calls the subclass to redefine2. The Kawai class does not overwrite a method, the parent class

Characteristics of variables in the child-parent class of the inheritance of Java learning

After the child parent class appears, the class member features:Make a clear list of members in a class:1. Variables2. Functions3. ConstructorsFirst, look at 1. Variables:If a non-private member variable with the same name appears in the child class,

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