abstract method

1. abstract and static (What) Abstract: It is used to declare abstract methods. abstract methods do not have a method body and cannot be called directly. They must be used after the subclass overriding. Static: Used to declare static methods. Static

Example5_12.javaAbstract classA {Abstract intAddintXinty); intSubintXinty) {returnX-y; }}classBextendsA {intAddintXintY) {//subclasses must override the parent class's Add method returnx+y; }} Public classExample5_12 { Public Static voidMain

Implementation of abstract method definition for enumeration types Package com. lc. day02.EnumTest; import org. junit. test; public class implements actenumtest {@ Testpublic void test () {print (Grade1. B);} public void print (Grade1 g)

Python abstract class + abstract method implementation interface (interface), pythoninterface # Python does not have interfaces similar to java and C #. You need to use abstract classes and abstract methods to implement interface functions.     #

Object-oriented programs are built from the hierarchical structure of classes, where the continuation of a class is tree-like in a single-resume language such as PHP. A root class has one or more subclasses, and then one or more sub-classes are

//the area of the largest graph Public classShapetest { Public Static voidMain (string[] args) {shape[] shapes=NewShape[4]; shapes[0] =NewSquare (1); shapes[1] =NewSquare (2); shapes[2] =NewCircle (1); shapes[3] =NewCircle (2); Maxarea (shapes); }

PHP getting started tutorial-object-oriented Feature Analysis (inheritance, polymorphism, interface, abstract class, abstract method, etc.), Getting Started tutorial Polymorphism This example describes the object-oriented features of PHP. We will

Java programs use abstract classes to implement abstract concepts of nature. The function of an abstract class is to organize many related classes together, providing a common class, an abstract class, and the concrete classes that are organized by

InterfaceInterface, English is called interface, in software engineering, the interface refers to the method or function for others to call. From here, we can realize the original intention of the Java language Designer, which is the abstraction of

Document directory Definition and usage rules of abstract classes: Definition Format of abstract classes: Concept: Interface Definition Format: Implementation Interface Inherited abstract class implementation Interface Interface inheritance

Original link: http://www.cnblogs.com/xdp-gacl/p/3651121.html The concept of an interface　　Java is only support single inheritance, but there are multiple inheritance in the reality of this phenomenon, such as "Golden Monkey is an animal", The

I. Interpretation 1 Use the keyword abstract in C # To define abstract classes and abstract methods. Classes that cannot be initialized are called abstract classes. They only provide partial implementation, but the other class can inherit it and

Interface differs from abstract class, interface abstract class difference What is the difference between an interface and an abstract class What is the basis of your choice to use interfaces and abstract classes? The concepts of interfaces and

What is the difference between an interface and an abstract classWhat is the basis of your choice to use interfaces and abstract classes?The concepts of interfaces and abstract classes are different. An interface is an abstraction of an action, and

In an object-oriented (OOP) language, a class can have one or more subclasses, and each class has at least one interface that the public method accesses as external code. and abstract methods are introduced to facilitate inheritance, now look at how

I. OverviewThe same action acts on different objects, can have different interpretations, and produces different execution results, which is polymorphism.The polymorphism in the component can be implemented in different ways:Interface

1. Interface: an interface is a special class, which is composed of a global constant (static final) and a public abstract method (abstract. [Java] interface A {// define interface A public static final String AUTHOR = "Li Xinghua"; // global

Interfaceneed to master the definition format and use of the interfaceMastering the relationship between interfaces and abstract classesSpecific content:interfaces are the most important concepts in Java, and interfaces can be understood as a

1. Abstract methods, abstract classes1) Abstract Method: Modified by abstract Only the definition of the method, no concrete implementation of the method (not even {}) The abstract method is a method of abstraction, and the

Transferred from: http://blog.csdn.net/sunlylorn/article/details/6124319Abstract class1. An abstract class is a class that has an abstract keyword in front of the class and an abstraction method (which adds the abstract keyword before the class