Tag: Java Spring Framework

Spring is frame work for different kinds of application development. It can provide bunch classes which is internally used the J2EE supplied classes. Meaning, we can say that spring is an alternate to struts but complement to J2EE.

Spring Framework Features 

Spring Framework is non invasive: No need for you to implement any interface or inherit any class from this framework to your classes.

Spring Framework is Light weight: Spring is a vast framework so users divide the whole spring in to different modules which are dependent to other module , except Spring core module.

End-to-end Development : Spring framwork supports almost all aspects of application development,  so users would be able to develop a complete application using it.

Spring Framework supports differet types of application development: We can develop any type of applications using Spring Framework. Example: Core java, web Application, Distributed application, Enterprise application.

Spring Framework is versatile: It can be integrated into any technology.

Spring Framework ports dependency injection: The dependency between classes are managed by spring framework.

Dependency injection:

Spring core is one module which deals with dependency management. This means that arbitrary classes provided to spring, can manage dependency.

What is dependency?

From a project point of view, multiple classes are specified with different functionality. Each of these classes required some functionality of other classes, Example:

1. class Engine
2. {
3. public void start()
4. {
5. System.out.println(“Engine started”);
6. }
7.  
8. }
9.  
10. class Car
11. {
12. public void move()
13. {
14. // For moving start() method of engine class is required
15. }
16. }

Here class Engine is required by class car so we can say class engine is dependent to class Car, So instead of we managing those dependency by Inheritance or creating object as fallows.

By Inheritance:

1. class Engine
2. {
3. public void start()
4. {
5. System.out.println(“Engine started”);
6. }
7.  
8. }
9. class Car extends Engine
10. {
11. public void move()
12. {
13. start(); //Calling super class start method,
14. }
15. }

By creating object of dependent class:

1. class Engine
2. {
3. public void start()
4. {
5. System.out.println(“Engine started”);
6. }
7.  
8. }
9. class Car
10. {
11. Engine eng=new Engine();
12. public void move()
13. {
14. eng.start();
15. }
16. }

Instead of managing dependency between classes, spring core handles the dependency management. However, the classes must be designed with some design technique that is Strategy design pattern.

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