9 crucial Java Design Principles you cannot miss

Feb 21, 20183 likes520 views

Encapsulation, Polymorphism, Agreggation / Composition, Overloading, Inheritance vs Composition, DRY, Dependency Injection, Delagation, Law of demeter, Principle of leas knowledge,

9 crucial Java Design Principles you cannot miss

1/9 What is Encapsulation ?
Much of object programming is centered on
minimizing the ripple effects caused by changes to a
program. This is done simply by keeping details
secret The principal ways of doing this are:
- minimizing visibility - private fields, package-private
classes (grouping into 1 domain package:
entity,repository,service,controller)
- generic references (polymorphism) - using high
level references (interfaces or abstract classes)
instead of low level references (concrete classes)

2/9 What is Polymorphism ?
The point of polymorphism is that you can subclass a
class and the objects implementing those subclasses
will have different behaviors for the same methods
defined in the superclass (and overridden in the
subclasses).

3/9 What is Aggregation / Composition ?
has-a relationship

4/9 What is Method Overloading ?
If a class has multiple methods by same name but
different parameters

5/9 Inheritance vs Compositions ?
inheritance - Java doesnt support multiple inheritance
(till java 8 , where we have default methods )
composition - Use private members
inh - you need super class instance
comp - easy to create Mock Object representing composed class
inh - it breaks encapsulation, when behavior of super class changes,
functionality in sub class may get broken
comp - you are flexible enough to replace implementation of
Composed class with better and improved version.
inh - Inheritance makes much sense like when a genuine parent child relation exists
comp
- In Decorator pattern, we dont extend any class to add additional functionality
Instead we keep an instance of the class we are decorating
and delegates original task to that class after doing decoration

6/9 What is DRY ?
avoid duplication for functionality , use dependency injection if needed.
but you can repeat same code (ie user authorization) for different functionalities in micro services or micro functionalities

7/9 What is Dependency Injection ?
Class injected by DI framework is easy to test with mock object
Easier to maintain because object creation code is centralized in framework
Done in Spring via proxies

8/9 What is Delegation ?
delegate tasks to ie:
equals, hashcode methods, thread pools
do not do it yourself on client side

9/9 What is Law of Demeter / Principle of least
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Artificial Intelligence is providing benefits in many areas of work within the heritage sector, from image analysis, to ideas generation, and new research tools. However, it is more critical than ever for people, with analogue intelligence, to ensure the integrity and ethical use of AI. Including real people can improve the use of AI by identifying potential biases, cross-checking results, refining workflows, and providing contextual relevance to AI-driven results. News about the impact of AI often paints a rosy picture. In practice, there are many potential pitfalls. This presentation discusses these issues and looks at the role of analogue intelligence and analogue interfaces in providing the best results to our audiences. How do we deal with factually incorrect results? How do we get content generated that better reflects the diversity of our communities? What roles are there for physical, in-person experiences in the digital world?

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9 crucial Java Design Principles you cannot miss

2. 1/9 What is Encapsulation ? Much of object programming is centered on minimizing the ripple effects caused by changes to a program. This is done simply by keeping details secret The principal ways of doing this are: - minimizing visibility - private fields, package-private classes (grouping into 1 domain package: entity,repository,service,controller) - generic references (polymorphism) - using high level references (interfaces or abstract classes) instead of low level references (concrete classes)

3. 2/9 What is Polymorphism ? The point of polymorphism is that you can subclass a class and the objects implementing those subclasses will have different behaviors for the same methods defined in the superclass (and overridden in the subclasses).

4. 3/9 What is Aggregation / Composition ? has-a relationship

5. 4/9 What is Method Overloading ? If a class has multiple methods by same name but different parameters

6. 5/9 Inheritance vs Compositions ? inheritance - Java doesnt support multiple inheritance (till java 8 , where we have default methods ) composition - Use private members inh - you need super class instance comp - easy to create Mock Object representing composed class inh - it breaks encapsulation, when behavior of super class changes, functionality in sub class may get broken comp - you are flexible enough to replace implementation of Composed class with better and improved version. inh - Inheritance makes much sense like when a genuine parent child relation exists comp - In Decorator pattern, we dont extend any class to add additional functionality Instead we keep an instance of the class we are decorating and delegates original task to that class after doing decoration

7. 6/9 What is DRY ? avoid duplication for functionality , use dependency injection if needed. but you can repeat same code (ie user authorization) for different functionalities in micro services or micro functionalities

8. 7/9 What is Dependency Injection ? Class injected by DI framework is easy to test with mock object Easier to maintain because object creation code is centralized in framework Done in Spring via proxies

9. 8/9 What is Delegation ? delegate tasks to ie: equals, hashcode methods, thread pools do not do it yourself on client side

10. 9/9 What is Law of Demeter / Principle of least knowledge ?

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