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Java Guides This page list down all java guides published on javaguides.net. Find published core java guides, REST API guides, java/j2ee design patterns, Logging and JUnit test guides. Core Java Guides Core Java Developers Guide Guide to OOPS Concepts Java String API Guide Java Collections Guide Java Arrays Guide Java Generics Guide Java Wrapper Classes Guide Java Enums Guide Java Exceptions Guide Java Reflection Guide Java I/O Guide Java 8 Developers Guide Date and Time API Guide Design Patterns Head First Design Patterns Core J2EE Patterns Design Patterns (GOF) Patterns of EAA Concurrency Patterns GRASP Patterns Spring Guides Spring Core Spring DI REST API Jersey (JAX-RS) Guide REST Tutorial Unit Testing JUnit 5 Guide JUnit 4 Guide Coding SOLID Principles Java Best Practices J2EE Best Practices Java Utility Classes Java/J2EE Best Practices Java Naming Conventions Single Responsibility Principle Liskov's Substitution Principle Interface Segregation Principle Dependency Inversion P...

This post is available on: http://www.javaguides.net/2018/07/factory-pattern-from-head-first-design-patterns.html Hi, I am  Ramesh Fadatare  from India, a founder, author, designer and chief editor of a  website   JavaGuides , a technical blog dedicated to the Java/J2EE technologies.  If you like my articles/guides then connect with me directly on   Google Plus ,  Facebook ,  LinkedIn ,  GitHub , and  StackOverflow . Please comment if you have any suggestions or feedback about my articles would be appreciated. Happy learning and keep coding !!!.

In this post, we will learn simple Observer Pattern implementation with examples from Head First Design Patterns Book. Read more on: http://www.javaguides.net/2018/07/observer-pattern-from-head-first-design-patterns.html

This post is moved to: http://www.javaguides.net/2018/07/facade-pattern-from-head-first-design-patterns.html

This post is moved to : http://www.javaguides.net/2018/07/template-pattern-from-head-first-design-patterns.html

This post is moved to: http://www.javaguides.net/2018/07/decorator-pattern-from-head-first-design-patterns.html

Creator  is the  GRAS Patterns (General Responsibility Assignment Software Pattern) Read about GRASP Patterns:  GRASP Patterns Overview Problem   Who should be responsible for creating a new instance of some class? The creation of objects is one of the most common activities in an object-oriented system. Consequently, it is useful to have a general principle for the assignment of creation responsibilities. Assigned well, the design can support low coupling, increased clarity, encapsulation, and reusability. Solution    Assign class B the responsibility to create an instance of class A if one or more of the following is true: ? B aggregates A objects. ? B contains A objects. ? B records instances of A objects. ? B closely uses A objects. ? B has the initializing data that will be passed to A when it is created (thus B is an Expert with respect to creating A). B is a creator of A objects. If more than one option applies, prefer a class B which aggregates...