abstract class vs interface java

Readexternal (ObjectInput in) throws IOException, ClassNotFoundException {EmployeeId = In.readint ();EmployeeName = (String) in.readobject ();}@Overridepublic void Writeexternal (ObjectOutput out) throws IOException {Out.writeint (EMPLOYEEID);Out.writeobject (EmployeeName);}}Comparison of abstract classes and interfacesParameter abstract class interfaceThe defau

Just learning Java, always feel that the interface and abstract class is very similar, but it is not specific what the difference. Today calm down, turn over the book, check the information, do a summary. Let's start with two examples to see what the similarities and differences between

. Details p163Nineth Chapter Interface1. Abstract classClasses that contain abstract methods are called abstract classes. Or it may not contain abstract methods (as if it makes no sense), as long as the class is decorated with an abstract.Abstract classes are useful tools fo

There are two mechanisms for Java to provide multiple implementations of an abstraction-Interface and abstract class.Interface and abstract class,In addition to the obvious differences (i.e., the ability to provide a basic implementation),The important difference is that the

I may be asked frequently during interviews. What is the function of interfaces? Compared with the class, why do you need to use the class to implement interfaces and so on. If you don't think about it, sometimes it gets stuck. This articleArticleThis section briefly introduces the functions of interfaces.An interface is a product used to mark a

implements Animal{ public void breathe(){ System.out.println("I‘m breathing"); } void eat(){ System.out.println("I‘m eating"); }}public class Test{ public static void main(String[] args){ Dog dog = new Dog(); dog.breathe(); dog.eat(); }}```No: Methods in an interface are modified by public by default, so when a subclass implements an

1. There is at least one method that is modified by the abstract, while the class that modifies the class name is an abstraction class, the abstract method must be covered by the quilt class, the

Class that contains the abstract modifier is an abstract class, an instance object that the abstract class cannot create. A class that contains an