difference between abstract class and interface in java

Abstract class and interface support the definition of abstract classes in Java. The existence of these two mechanisms gives Java powerful object-oriented capabilities. Abstract class a

This article transferred from: http://blog.csdn.net/fanteathy/article/details/7309966Difference:1, the use of the interface is through the keyword implements. The use of abstract classes is through the keyword extends. Of course the interface can also be inherited by the keyword extends.2. You cannot declare member variables (including class static variables) in an interface, but you can declare

Always feel that they are two things is not a thing, a kind of chaotic feeling. Reply to discussion (solution) Abstract classA series of methods are defined, and the methods that must be implemented by the inheriting class are defined. Abstract classes cannot be instantiated due to the existence of an abstract me

the method of the parent class, but the method name, parameter type, and number of arguments must be the same! Overrides of methods (overriding) and overloads (overloading) are different manifestations of Java polymorphism, which is a representation of polymorphism between parent class and subclass, and overloading is a representation of polymorphism in a class.

java– virtual functions, abstract functions, abstract classes, interfaces 1. Java virtual functions The existence of virtual functions is for polymorphism. C + + Ordinary member function plus virtual keyword becomes virtual function In Java, there is no concept of virtual

1. Java virtual functionsThe existence of virtual functions is for polymorphism.C + + the normal member function plus Virtual The keyword becomes a virtual functionjava c++ java java final keyword becomes non-virtual function PS: actually C + + and the Java The point of view in virtual function is similar.

some unsafe factors; therefore, you can use final adornments when you need to ensure that a class cannot be inherited) Java provides a final method in the object class: GetClass (). Because Java does not want any class to override this method. 10.

deep understanding of these two object-oriented basic content, for the enliven object-oriented abstract programming idea is very important. This article basically outlines the interface and abstract class concepts, similarities and differences and the use of rules, from a learning point of view, I think these summaries are enough to express its core. But with an

abstract class Multi-Implementation Single inheritance The object cannot be constructed directly, and if you want to construct it, you must inherit from the subclass and then construct Interface Using the interface keyword declaration, the modifier is public The variables in the interface must be public static final, and this qualification is the default. The met

Copy Code code as follows: Definition of abstract class: Abstract class ku{//Defining an abstraction Abstract function kx (); ...... } function AA extends ku{ Ways to implement abstract classes function kx () { Echo '

public levelAbstract classes can contain fields, but interfaces cannot,Abstract classes can inherit interfaces, but interfaces cannot inherit abstract classes.Abstract class members can have specific implementations, but interfaces cannot.The abstract subclass can selectively implement the

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 an abstract

Before learning the object-oriented design patterns, Java interfaces and abstract classes are vague and hard to understand. When I first learned the Java language, it was hard to understand why the concept of interfaces was required. Although multi-inheritance can be implemented, there is only a method name and no method body, how can I implement it? I can't get

methods to rewrite System.out.println ("Talk to customers about demand");} public int Getbonus () {return bonus;} public void Setbonus (int bonus) {this.bonus = bonus;}} Class AbstractTest4 {public static void main (string[] args) {//test common employee, use polymorphic to implement employee EMP = new Programmer (); Emp.setname (" Brigitte "); Emp.setid (" 001 "); emp.setsalary (8000); System.out.println (Emp.getname () + "---" +emp.getid () + "---"

In the Java language, abstract classes and interface are the two mechanisms that support the definition of an abstraction class. It is the existence of these two mechanisms that gives Java a powerful object-oriented capability. Abstract