abstract class in java

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 () + "---"

First, exhausting and abstract methods1. Abstract methods in abstract classes must be implemented by the quilt class unless the subclass is also abstract.2. Abstract class cannot be ins

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

The concept of abstract classes:A class that contains an abstract method is an abstract classAbstract method:A method that is declared without being implemented is an abstract method that must be declared with the abstract keyword

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 Java interfaces and abstract classesHttp://baike.baidu.com/view/24932

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 (String args[]) {b b=NewB (); intSum=b.add (30,20);//call the subclass override of the Add method intSub=b.sub (30,20);//Call sub method inherited by subclassSystem.out.println ("sum=" +sum);//output is

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.

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