Factory Method Design Pattern. Bengali-Ep:27 #learnjava #bengali #designpattern #designpattern

Hi, Hope you are all doing great. Let's learn together. Join Telegram: ? https://t.me/contactajoydebnath Chapters ❤ 0:00 Introduction 02:41 Factory Method Design Pattern Code Implementation Note: Java was developed by Sun Microsystems (which is now a subsidiary of Oracle) in the year 1995. James Gosling is known as the father of Java. Before Java, its name was Oak. Since Oak was already a registered company, James Gosling and his team changed the name from Oak to Java. Document Link - https://docs.google.com/document/d/1THk7M9-ZkJqwRTA-WlTHzIz1y9RDMzsM_TXKOyx_Fuo/edit?usp=sharing STS Link: https://spring.io/tools JDK Link: https://www.oracle.com/java/technologies/downloads/ Video Links: String Playlist : https://www.youtube.com/playlist?list=PL0LQjbMWLlS3tXLVZBuLmsMJ9dU6JNtGD Java Videos Links : How to create Immutable class in Java? Immutable Design Pattern. -- https://youtu.be/NJE2wrvsdaY Object Cloning, Shallow Copy and Deep Copy. -- https://youtu.be/YppKcqWoaZA Excetption, Custom Exception, throw, throws -- https://youtu.be/0cSas4k7CUQ Excetption, try, catch, finally -- https://youtu.be/8l-fXr_nYe4 Exception, Exception Hierarchy, Call Stack, Propagation. Bengali-Ep:22 -- https://youtu.be/D4cigYGNtu8 Lambda Expression, Functional Interfaces, Anonymous Class. -- https://youtu.be/o88ycNO3R7Q Singleton Pattern. Lazy Instantiation for Multiple Threads.Part-2 Bengali-Ep:20 https://youtu.be/gplmcZV7gp4 Singleton Design Pattern in Java. Early & Lazy Instantiation Bengali-Ep:19 : https://youtu.be/UHtUOSvqVs4 HashSet, Its Methods & How It Works Internally in Java : https://youtu.be/nQOLOBlgw-w HashSet & How It Works Internally in Java. -- https://youtu.be/7YPTXWkqzV8 LinkedList,Methods & How It Works Internally in Java. -- https://youtu.be/jw_KoDctxtg ArrayList, ListIterator, How It Works Internally -- https://youtu.be/O3QrQHQyiLQ Collection Framework ---- https://youtu.be/DFzzcqt7Gvk 'super' keyword - https://youtu.be/Jj1E2M6e-O0 'this' keyword - https://youtu.be/x_TJINrbqtk Final Keyword - https://youtu.be/GaprusN0uNE Static Keyword, Static variable, block, method, nested class - https://youtu.be/tgzUgat88_A Access Modifier. Private, Public, Default, Protected -- https://youtu.be/Fkkcc6ypCtw Encapsulation, Data Hiding, Setter-Getter method, JavaBean Class -- https://youtu.be/ZH4GwBWXpPQ Polymorphism, Method and Constructors Overloading, Method Overriding -- https://youtu.be/mCMqkKGrb7s Inheritance, Is-A relationship, the problem with multiple inheritances -- https://youtu.be/y6HgMh-I45M Abstraction, Interface -- https://youtu.be/E86QsfsNTIY Abstraction, Abstract Class - https://youtu.be/vgKCmdgcI_0 What is Class, Object, Method, Constructors- https://youtu.be/vFpK067HbCs Environment Setup and why we need to set path in environment variable -- https://youtu.be/p6MLxaCKr80 First Java Program - "Hello World" -- https://youtu.be/7F1TdO4KeiM Spring Video Links: JDBCTemplate, RowMapper,ResultSetExtractor,BeanPropertyRowMapper Spring -- https://youtu.be/NsytsxHTUro Spring JDBCTemplate, JDBC, Statement and PreparedStatement -- https://youtu.be/jkc3RzTxzXE What if we remove @Configuration annotation in Spring? -- https://youtu.be/lmQ0sy74QkA @Configuration, @Bean, @Component, @ComponentScan in Spring. -- https://youtu.be/OXFVdoxX4SE Autowiring, Autowiring Modes - byName, byType & constructor. -- https://youtu.be/0catrd8gf98 Bean Scope ,Sinton Scope and Prototype Scope. -- https://youtu.be/sBNSi2FCaf4 IOC Container, BeanFactory, Important APIs, Lazy & Eager Loading. -- https://youtu.be/ZHFmQ5P7dU0 IOC,Dependency Injection,IOC Container,Coupling - https://youtu.be/oRBw1H2_C4k Like, Comment, Share, and Subscribe. Thank you again. Design pattern: Design patterns represent the best practices used by experienced object-oriented software developers. Design patterns are solutions to general problems that software developers faced during software development. These solutions were obtained by trial and error by numerous software developers over quite a substantial period of time. What is a Gang of Four (GOF)? In 1994, four authors Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides published a book titled Design Patterns - Elements of Reusable Object-Oriented Software which initiated the concept of Design Patterns in Software development. These authors are collectively known as Gang of Four (GOF). Factory method design pattern in Java. A Factory Pattern or Factory Method Pattern says that, just define an interface or abstract class for creating an object but lets the subclasses decide which class to instantiate. In other words, subclasses are responsible for creating the instance of the class. It is a creational design pattern that talks about the creation of an object. What is upcasting? Upcasting is the typecasting of a child object to a parent object. Upcasting can be done implicitly. Parent parent = new Child();

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