Java Polymorphism is an important concept in object-oriented programming, and mastering it is crucial to improving the flexibility and scalability of your code. PHP editor Youzi will take you to deeply explore the nature and implementation methods of Java polymorphism, helping you better understand the role of super classes and the art of polymorphism, so that you can be comfortable in Java programming.
In Java, superclass refers to the parent class of the derived class. Superclasses provide common behaviors and properties to derived classes, and derived classes can inherit and extend superclasses.
The main functions of super class are:
The Art of Polymorphic Implementation
The implementation of polymorphism mainly relies on inheritance and method rewriting. Inheritance allows a derived class to inherit behaviors and properties from a superclass, while method overriding allows a derived class to modify inherited methods in the superclass.
The art of polymorphic realization is reflected in the following aspects:
Demo code
class Animal { public void eat() { System.out.println("Animal is eating."); } } class Dog extends Animal { @Override public void eat() { System.out.println("Dog is eating."); } } class Cat extends Animal { @Override public void eat() { System.out.println("Cat is eating."); } } public class Main { public static void main(String[] args) { Animal animal = new Dog(); animal.eat(); // prints "Dog is eating." Animal anotherAnimal = new Cat(); anotherAnimal.eat(); // prints "Cat is eating." } }
In this code, both the Dog and Cat classes inherit the Animal class and override the eat() method. When the animal variable is assigned to the Dog object, calling the eat() method will print "Dog is eating." And when anotherAnimal variable is assigned to the Cat object, calling the eat() method will print "Cat is eating.".
Conclusion
Polymorphism is an important feature of Object-oriented programming in Java, which allows subclass objects to be referenced and used as superclass types. Through inheritance and method overriding, polymorphism allows derived classes to extend and modify the behavior and properties of superclasses.
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