abstract class vs interface java

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.

All properties in the interface are public static final, and the methods are public. The access modifier must be either the public interface or the other interface, similar to the inheritance of the class, the keyword extendsHttp://www.cnblogs.com/dolphin0520/p/3811437.htmlDeep understanding of

HEAD first this series of books, really let people produce the pleasure of reading ~ ~:)The same as the science of tomorrow.InterfaceNose { Public intIMethod ();}Abstract classPicassoImplementsNose { Public intIMethod () {return7; }}classClownsextendsPicasso {//Pass}classActsextendsPicasso { Public intIMethod () {return5; }} Public classDotcombustextendsClowns { Public Static voidmain (String [] args) {Nose [] I=NewNose [3]; i[0] =NewActs (); i[1] =Ne

implementation of the situation.3, achieve multi-inheritance effect.ExampleAn example of a abstract class in the JDK are Abstractmap, which is part of the collections Framework. Its subclasses (which include HashMap, TreeMap, and Concurrenthashmap) share many methods (including get, put, IsEmpty, CO Ntainskey, and Containsvalue) that Abstractmap defines.An example of a

probably the only advantage of Java Abstract classes, however, this advantage is very useful. For example, if a new method is added to an abstract class, all its subclasses will get this new method at once, and the Java interface

extends Fruit { @Override public void weight () { System.out.println ("fruit weight"); } } This class inherits the price () method of the class fruit and implements the weight () method of the fruit abstract class. Inheriting an interface

interface .　　Abstract class In object-oriented concepts, all objects are depicted by classes, but conversely, not all classes are used to depict objects , and if a class does not contain enough information to depict a specific object, such a class is an

(i) overviewIn the Java language, abstract classes and interface are the two mechanisms that support the definition of an abstraction class. It is precisely because of the existence of these two mechanismsIn order to give Java a powerful object-oriented capability. The

(1) OverviewAbstract class and interface support the definition of abstract classes in Java. It is precisely because of the existence of these two mechanisms Only in this way can Java provide powerful object-oriented capabilities. Abstra