SOLID principles

 SOLID:

1. S - SRP: The single responsibility principle. A class should have one, and only one, reason to change.

This means that every class, or similar structure, in your code should have only one job to do. 

2. O - OCP: The Open Closed Principle. You shoul be able to extend a classes behaviour, without modifying it. Open to extention means that you shoul design your classes so that new functionality can be added as new requirements are generated. Closed for modifications means that once you have developed a class you shoud never modify it, except to correct bugs.

3. L - LSP: Liskov substitution priciple. Derived classes must be substitutable for ther base classes. That means we have to construct our hierarchy from simple to complex. So that complex extends from simple. 

4. I - ISP: The interface segregation principle. It states that client should not be forced do depend upon interface members they do not use.

5. D - DIP: Dependency inversion principle. It states that high-level modules should not depend upon low-lewel modules; they should depend on abstractions. Secondly, abstractions should not depend upon details; details hould depend upon abstractions.

Комментарии

Отправить комментарий

Популярные сообщения из этого блога

Lesson1: JDK, JVM, JRE

Изображение
1. Compiler - takes the entire programming code written in high language and translates the whole of it into machine code at once. After this process the an executable file will be ready to run. The translation takes some times to be done, but after that execution is so fast. 2. Interpreter - takes each single instructions of the code translates it and then executes it on its own. The translation step is before the program runs is fast, but execution is slow. JDK = JRE + development tools JRE = JVM + library class JDK -> Java Development Kit. A kit which provides the environment to develop and execute (run) Java program. JRE -> Java Runtime Environment. Provides environment to only run. JVM -> Java Virtual Machine f * Compiled: Fortran, C, C++, Pascal, Haskell, Rust, Go * Interpreted: JavaScript, PHP, Python, Ruby Java both compiled and interpreted language. Terminalda : javac Main.java yazdiqda, source fayli(.java) bytecode(.class) faylina cevirir. Terminalda: java Main (bu z
Далее...

SE_21_Lesson_11: Inheritance, Polymorphism

->  instanceof anlayishi, misallarla izahi   package org.example.lesson_13 ; public class Ulubaba { public String ad ; public String soyad ; public Integer yash ; public void odunDogramaq () { System . out .println( "Ulubaba 50 kq odunu 1 saata dograyir" ) ; } } package org.example.lesson_13 ; public class Baba extends Ulubaba { public String hobbi ; public void otBicmek () { System . out .println( "Baba 1 hektar otu 1 gune bicir" ) ; } } package org.example.lesson_13 ; public class Main { public static void main ( String [] args ) { Baba baba = new Baba() ; System . out .println( baba instanceof Ulubaba ) ; System . out .println( baba instanceof Object ) ; } } -> Upcasting package org.example.lesson_13 ; public class Main { public static void main ( String [] args ) { Ulubaba u = new Baba() ; } } -> Downcasting Problemsiz situasiya: package org.example.lesson_13
Далее...

SE_21_Lesson_9: Initialization Blocks, Wrapper types, String class

Изображение
-> static block: package org.example.test3 ; public class Blocks { static { System . out .println( "In static block" ) ; } public static void method () { System . out .println( "In static method" ) ; } } package org.example.test3 ; public class Main { public static void main ( String [] args ) { Blocks . method () ; } } -> Class.forName() metodunu ishe salmaq: package org.example.test3 ; public class Blocks { static { System . out .println( "In static block" ) ; } } package org.example.test3 ; public class Main { public static void main ( String [] args ) throws Exception { Class . forName ( "org.example.test3.Blocks" ) ; } } -> non-static (instance) block: package org.example.test3 ; public class Blocks { static { System . out .println( "in static block" ) ; } { System . out .println( "in non static (instance) block
Далее...