Understanding Requirement: Why Java
Why Java is important to the Internet
Java On Linux
First Java Program
Java Virtual Machine Architecture
Class Loading Process by Class Loaders
Role Of Just In Time Compiler
Execution Engine
Data Types
Variables
Arrays
Operators
Arithmetic Operations
Shifting Operators
Logical Operators
Control Statements
Object Oriented Paradigms
The Three OOP principles
Looping Statements
JAVA Class Fundamentals
Command Line Arguments
Static Initialize
Creating an Object
Instance Variable Hiding
Overriding and Overloading of methods
Understanding The Access Controls
Nested And Inner Classes
Dynamic Method Dispatching
Abstract Classes
Using Final To Prevent Overriding & Inheritance
Garbage Collection
Defining a package
Understanding Classpath
Access Protection
Importing packages
Defining and Implementing An Interface
Abstract classes vs Interfaces
Generics
Annotations
Varargs
Foreach
Fundamentals Of Exception Handling
Types Of Exceptions
Learning exception handling, try-catch, multiple catch clauses
Nested Try Statements
Throw, Throws and Finally
Custom Exceptions
Java Thread Model
Creating A Thread
Context Switching
Synchronization: Methods And Statements
Inter-thread Communication
Container is the application server which performs control and at the same time gives us services through an interfaces. J2EE container is the one which helps us to deploy and execute J2EE components. In J2EE specification there are five types of containers which are divided in two groups:
Server Side Containers:
Server, which provides J2EE runtime environment
EJB (Enterprise JavaBean) container which manages EJB beans
A Web container which manages servlets and JSP (Java Server Pages).
Client Side Contaienrs:
An application container for UI, batches or console
Applet which is container meaning a browser; Usually it happens with Java plugin
Let’s shortly review each of them.
J2EE server: J2EE product which provides EJB and Web containers and happens at runtime
Applet Container: Applet container includes support for the applet programming model. The applet container is a mixture of java plugin and web browser on client machine. If applet container runs in an applet it guarantees with security and portability.
During applet execution there are following steps, we can refer them as a lifecycle of applet:
Loading of applet
Creation of applet
Initialization of applet with calling init() method
Starting of applet with calling start() method
Stopping of applet with calling stop() method
Application Client Container: For hosting application the application client container is used. It runs on the client computer. It helps developers to build powerful Java applications with having access to J2EE resources such as EJBs or data sources. The execution of application client components is managed by container. All application operations between users and databases can be handled by application server.
Web Container: Web container which is also known as servlet container is the one which runs web applications inside itself. A web container provides identical services as a JSP container. Web server is a component which is able to handle HTTP request send by a client and then send HTTP response back.
Enterprise JavaBean (EJB) Container: Enterprise JavaBean container is a server-side architecture. The main usage of it is to build modular structure of enterprise application. Enterprise JavaBean container provides a run-time environment for enterprise beans within the application server. It plays an intermediary role between the user-written business logic and the rest of the application server environment. Execution of enterprise beans for J2EE applications is managed by EJB. The EJB container provides local and remote access to enterprise beans. Enterprise bean depend on data can be divided into message-driven beans, entity beans, and session beans. Message-driven beans asynchronously pass messages to application modules and services. Entity beans represent persistent data, typically maintained in a database. Session beans represent transient objects and processes and typically are used by a single client.
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