java abstract class example

Patterns-factory methods-abstract factories;public class MSIK7N2G implements mainboard{public void Attach (CPU CPU) throws exception{if (Cpu.getclass (). toString (). EndsWith ("AMD")) {System.out.println ("msik7n2g");}else{throw new Exception ("Motherboard msik7n2g only with AMD CPU");}}} Package com.yq1012. Creating Patterns-factory methods-abstract facto

Usage:In abstract class mode, a class can have its own data member, or it can have a non-abstract member method, and in the implementation of the interface method, the class can only have static data members that cannot be modified (that is, must be static final , but the da

() {System.out.println ("Scream ~ ~ ~"); }*/ Public Abstract voidEnjoy ();//declaring abstract methods}classDog extends animal{PrivateString Forlorcolor; PublicDog (String name,string forlorcolor) {super (name); This. Forlorcolor =Forlorcolor; } Public voidenjoy () {System. out. println ("Dog Barking ~ ~ ~"); }}classCat extends animal{PrivateString Eyescolor; PublicCat (String name,string eyesco

Click to enter _ many other _java thousand ask1. What is the difference between an interface and an abstract class?In the Java language. Abstract class and interface interface are two mechanisms of abstract definition.It is the ex

Super Keyword:When the parent class is overridden, the subclass object cannot access the overridden method of the parent class, and super is to solve the problem:1. Use the Super keyword to access the member variables and member methods of the parent class:Super. Member variablesSuper. Member method ([Parameter 1, ...])2. Use the Super keyword to access the constructor of the parent

("End of Battle");} abstract void Attack ();p ublic Void Action () {//Action template Ready (); attack (); end ();}} Class Landsoldier extends Soldier{public landsoldier (String name) {super (name);} public void Attack () {System.out.println ("Army Soldier" +getname () + "start Attack");}} Class Oceansoldier extends Soldier{public oceansoldier (String name) {sup

Java AbstractMap abstract class Jdk1.8.0 _ 144: http://www.bkjia.com/softs/551512.html The AbstractMap abstract class implements some simple and common methods, and is not difficult. However, there are two methods in this abstract

Abstract classes are often used to characterize the abstract concepts we derive in the analysis and design of the problem domain, as an abstraction of a series of concrete concepts that look different, but are essentially the same, and we cannot instantiate them (not get a concrete one) so they are called abstractions. For example: We want to describe "fruit", it

Interface 1. Because Java does not support multiple inheritance, an interface can inherit only one parent class, but multiple interfaces can be implemented. The interface itself can inherit multiple interfaces. 2. The member variables in the interface are of the public static final type by default. Initialization that must be displayed. 3. All methods in the interface are public

;publicstaticfinal that belongs to graphic class doublepi=3.14;publiccircle (Stringname,doubler) {super (name); THIS.R =r;} The area of Publicvoidgetarea () {System.out.println (name+) is: "+pi*r*r);} The perimeter of Publicvoidgetlength () {System.out.println (name+) is: ' +2*pi*r ';}} Rectangle belongs to the one classrectextendsmyshape{intwidth;intheight;public in the graph Rect (StrIngname,intwidth,intheight) {super (name);this.width=width;this.

; } public double area ()//calculates the rectangle size, implementing the parent class's abstract method {return this.width*this.length; } public double perimeter ()//calculates the perimeter of the rectangle, implementing the abstract method of the parent class {return (this.width+this.length) * *; } public void SetLength (double length) {this.length =

multiple interfaces at the same timeWhy should I use an interface?1, to complement the single inheritance structure.2, the interface enriches the polymorphism of the object.3, interface-oriented programming (programming or architectural thinking)The goal of software development:A center, two basic points.Everything is centered on user needs,Ensure the software has good scalability and maintainabilityCohesion-poly, low-couplingCohesion: The ability of a software system to accomplish a task indep

subclass, the other is handed over to the local operating system. If it happens at the same time, it is tantamount to handing over the implementation to the subclass and handing the implementation to the local operating system, who is going to implement the specific method?2, interface is a special kind of abstract class, the method in the interface is all abstract