Java interfaces design perspective
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The document discusses Java interfaces and their significance in application design, highlighting the importance of abstraction and design patterns. It explains how interfaces serve as communication points in programming, enabling loose coupling and dynamic binding. The content emphasizes good design practices, such as programming to an interface rather than an implementation, which can facilitate application growth and adaptability.
Java interfaces design perspective
- 1. Java Interfaces Design Perspective Chennai Java Summit - 2013 Manigandan Venkataraman [email protected]
- 2. Agenda ● Application ● Interface – What is an Interface ● Components and Interface ● Java Interface ● Abstraction & Interfaces ● Design Patterns ● Good Design Practices
- 3. Applications ● Applications that can grow ● Plugins and Addons ● Examples – – ● Application should grow – ● Browser - Firefox IDE – Eclipse, Netbeans Provide plugin/ addon design How to design such an application???
- 4. Interface ● What is an INTERFACE ● Tell me the interface for this room ● Doors ● Windows ● Interfaces are nothing but communication points ● How do you interface with your Bike or Car ● Interfaces to the Computer ● USB, HDMI, VGA , Serial Ports ● Will this device work with my computer????
- 6. sum(int,int) MyCalculator sub(int,int) Component Interface = method signature + return type
- 7. Operation WebService operation ● ● RMI – Stubs and Skeletons We need Remote Interfaces to compile the local code ● ● Webservice endpoints are interfaces Only interface and NO LOGIC
- 8. Java Interface ● A way to implement multiple inheritance ● Interface is a collection of abstract methods ● ● now, we can have default implemented methods too .... :) All methods in an interface are public
- 9. Abstraction ● What does Abstract mean ??? ● I need to go to Mumbai – abstract statement ● Whats missing – – – ● Means of transport Date and time Budget I am travelling to Mumbai on Monday 7 am, by Indigo – Concrete Statement
- 10. Abstraction ● Your College Project ● Abstract - ???? – – – ● Problem Statement Solution Whats missing - How ??? The Implemention Where's the Implementation – The whole project is the Implementation !!!! ;)
- 11. Abstraction ● An idea without Implementation ● Why do we need it?? ● Object Oriented Design Interfaces have abstract methods
- 12. Abstraction and Interfaces ● Runnable Interface ● <Code> ● What it does ● JVM has to deal with unknown code ● Its not aware of Our Code ● Interface Design provides Loose Coupling ● Eclipse Rich Client Platform ● Netbeans Platform
- 13. Design Patterns ● Mixture of Abstract Classes and Interfaces ● No logic, only provides a guideline/approach ● Upto to programmer to write an implementation – logic
- 14. Good Design Practices ● Program to an interface , not to implementation ● ● ● Spring Framework Code can grow, more implementations clients remain unaware ● ● ● of the specific types of objects they use, as long as the object adheres to the interface of the classes that implement these objects; clients only know about the abstract class(es) defining the interface Use of an interface also leads to dynamic binding and polymorphism
- 15. Thank You