quanta ocp

specific animal, which reduces the coupling between objects. However, if we want to add a new type of animal, we still need to modify the code in the factory class (new case statement Judgment), which also violates the OCP principle, and also causes the implementation logic in the factory class to be too complex, this is also the disadvantage of the simple factory model! 3. Factory method mode Background: In order to solve the problem that the simple

terminology."Real World"the object of concernWhat to Do ( How),implement functional specifications through the model. OOPbased on the design, use a programming language such asJava) encoding. ThroughOOA,OODand theOOPThe main line is abstract. OodGraphical Modeling Language for modelingUML(Unified Modeling Language), UMLis a generic modeling language that we use in our experimentsUmbrello is modeled,Windowsrecommended for everyone to useStarUML.The result of a process abstraction is a function,

Simple FactoryAdvantages and disadvantages of a simple factory:Cons: ① violates the OCP (open-closed principle). (When adding a method in the factory to create an object, you need to add a case statement in the original factory). Modifying the original class is a violation of design principles.② increases the coupling of the client and factory classes.Pros: ① Remove (non-degrade) the coupling of the client and the specific product. Add a factory class

Design mode Simple Factory + factory method + Abstract FactoryRead Catalogue Simple Factory Product tree (product grade) + product family Factory method Abstract Factory: Back to the top of the simple factoryAdvantages and disadvantages of a simple factory:Cons: ① violates the OCP (open-closed principle). (When adding a method in the factory to create an object, you need to add a case statement in the original factory). Modif

User Management Recovery Oracle Recovery Architecture Ii. Recovery type: instance recovery, media recovery 1, the premise of the recovery of the data files, control files and online logs are not damaged, fully automatic 2, media Recovery: In the case of physical damage to the file, restore, restore, and finally make the database open to the normal operation known as media recovery, human intervention Third, Recovery mode: Full recovery, incomplete recovery Iv. Recovery technologies: User M

/]$ cd/mnt/dvd/repo/ [ROOT@OCP repo]# Ls-l Total 668 Drwxr-xr-x 2 root root 679936 Nov 2013 SuSE Drwxr-xr-x 2 root root 4096 June 1 23:33 repodata [ROOT@OCP repo]# createrepo-g repodata/repomd.xml. Spawning worker 0 with 3754 pkgs Workers finished Gathering worker Results Saving Primary Metadata Saving file lists Metadata Saving other metadata Generating SQLite DBs Sqlite DBs Complete [ROOT@

/temp01.dbf ' reuse;Scenario 3: Rebuilding with read-only data filesStartup Nomount;CREATE controlfile Reuse DATABASE "Bxdb" Noresetlogs ...Recover database; --recover database using Backup controlfile;ALTER DATABASE open; --alter database open resetlogs;Alter DATABASE rename file '/u01/app/oracle/product/11g/dbs/missing00005 ' to '/u01/app/oracle/oradata/bxdb/tp2.dbf ';Alter Tablespace TP12 Online; --Cannot set up data file online (ALTER DATABASE datafile 7;)ALTER tablespace TEMP ADD tempfile '

Labels: Object-oriented Design Principles After the previous in-depth explanation, we have basically made it clear about the solid principle. However, if you want to skillfully apply the solid principle, it is not enough to know what the solid is, we also need to know when and when the solid principle is applied (when or where ). Fortunately, the five independence principles of the solid principle are essentially independent in actual applications, it is not necessary to select an optimal princ

Java and mode notes Chapter 4 "Open-Close" principle (OCP) OCP: Open-closedprinciple: indicates that a software entity should be open to extensions and closed to modifications. It was first proposed by bertrandmeyer. Original article: softwareentities shocould be open for extension, but closed for modification. OCP is considered to be the first cornerstone of obj

preliminary1. S.O.L.I.D principleObject-oriented three elements are "encapsulation, inheritance, polymorphism", and any object-oriented programming language will support these three elements syntactically. It is very difficult to use the three elements, especially polymorphism, with the help of abstract thinking, and the S.O.L.I.D design principle is a good guide: SRP (Single Responsibility Principle, sole responsibility principle) OCP (

Experiment two Java object-oriented programming experiment requirements1. Submit the last three JUnit test cases (normal, error, boundary condition) through, to have paint and watermark, enter their own school number. This submission point examines whether JUnit will be used, and test cases should at least contain normal, error, and boundary conditions.2. Learn Java using JUnit and study StringBuffer in TDD. Submit your Unit test case and test pass, plus a number watermark. Testing yourself will

Experiment Description: (1) Create 2 table spaces first. Create Tablespace User01 DataFile '/opt/oracle/oradata/ocp/user01.dbf ' size 1M; Create Tablespace User02 DataFile '/opt/oracle/oradata/ocp/user02.dbf ' size 1M; (2) Create a table on each table space. CREATE TABLE Scott.customers (cust_id int,cust_name varchar2 ()) tablespace User01; CREATE TABLE Scott.sales (ID int,cust_name varchar2 (a),

The Richter replacement principle (Liskov substitutiion PRINCIPLE,LSP) is called the cornerstone of inheritance reuse, and it is presented even earlier than the OCP. Unfortunately, due to the different understanding of this principle, after many translations, the LSP has become one of the most controversial topics in ood design principles. In fact, at the OOPSLA conference in 1987, Ms. Liskov of the MIT Computer Science Lab published the classic artic

violate the dry principle mentioned earlier, and we can solve this problem by inheriting the color attribute and the corresponding method into the parent class animal, as shown in the following UML figure:(Note that the representation of inheritance in UML class diagrams is to refer to the parent class with a triangular line)G. Further abstraction, abstract the bark () and Cat Class Meow () in the dog class into an abstract method shout (), which overrides this method in the dog class and Cat c

GetColor () {return color;}public void SetColor (String color) {This.color = color;}Public abstract String shout ();}public class Dog extends animal{Public String shout () {return "Bark";}Public String toString () {Return "The Dog ' s color is" + this.getcolor () + ", and it shouts" + this.shout () + "!";}}public class Cat extends animal{Public String shout () {Return "Meow Meow";}Public String toString () {Return "The Cat ' s color is" + this.getcolor () + ", and it shouts" + this.shout () + "

before explaining the simple factory pattern, it is necessary to understand some of the principles of OO NBSP;1.OCP (opening and closing principles, open-closed principle): A software entity should be open to extension and closed to modifications. That is, for an existing software, if it needs to be extended, it should be done on the basis that there is no need to modify the existing code. 2.DIP (relying on the reverse principle, dependence inver

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Author: Brian peasland, Senior Expert at the techtarget website searchoracle, Sgt, Inc. Head DBA. Oracle 7.3, 8 and 8i OCP, Master's degree in computer science, specializing in database. Brian has been working in the IT industry for 20 years, from computer operators to Operation analysts, then to system administrators, and then to application software developers until now the DBA. it can be said that Brian's career history is a complete DBA growth gui

: Simple Factory:A specific factory creates multiple products using condition statements. The product creation logic is concentrated in one factory class.The client transmits different parameters to the factory to create different products.When adding a new product, you need to modify the factory class and add the product class, which does not comply with the OCP principle. Factory method:A factory creates a product, and all specific factories inherit