What is Database Architecture

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Database  Architecture  Database store a lot of critical information to access data quickly and security we need to select the correct architecture for efficient data for management client for the machine is the database architecture client  . Database management system architecture help user to get their into a request done file connecting with database . We choose the database architecture based on the following factures  1.Size of the database                                                                            2.Number of users                                                                      ...
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What is Java Environment and Java Development Kit

                           Java Environment

Java environment includes a large number of development tools and hundreds of class and methods. The development tools are part of the system  known as java development kit (JDK) and the classes and methods are part of the java standard library (JSL) also known as the Application Programming Interface (API). 





                        .Java Development Kit

The java Development kit comes with a collection of tools that are used for developing and running java program . They include:             
      . Applet Viewer (for viewing java applets)
      . Java c (Java compiler )
      . Java (java interpreter)
      . Java p (java disassembler)
      . Java h (for c header files )
      . Javadoc (for creating  HTML documents )
      . JDB (java debugger ) 

The way these tools are applied to build and run applications program is illustrated into create a java program we need to create a source  code files using a text editor . The source code is than compiled  using the java compiler java c and executed using the java interpreter java a. The java debugger JDB is used to find if any in the source code. A compiled java program can be converted into a source  code with the the help of java disassembler java p. We learn more about these tools as we work through the books 

        Application Programming  Interface

The java Standard library (API) includes hundred classes and method grouped into several  functional packages (see Appendix G) most   commonly used packages.                                                             
1. Language Support Package: A collection of classes and method in  required for implementing basic features  of java                                                                                          
2.Utilities Packages: A collection of classes toprovide utility function f  such as date and time function                                                                                                            
3. Input/Output Package: A collection of classes required for input /output manipulation  

                                                                                                    
4. Networking Packages: A collection of classes for communication    with other computer via Internet

                                                                               
5. AWT Package: The abstract window Tool Kit package contains class that implement platform independent graphical use interface. 

                              
6. Applet Package: This include a set of classes that allow us to class  java applets. The use of these library classes will become evident when we start developing java program

        Java  Runtime Environment

The java runtime environment  (JRE) facilitates the execution of program developed in java . It primarily comprises of the following 


1. Java virtual machine (JVM): It is a program that interprets the intermediate java byte code and generates  the desired output. It is because of byte code JVM concept that program written in java.

2. Runtime class libraries: These are a set of core class libraries that are required for the execution of java program

3. User interface toolkit: AWT and Swing are example of toolkit that support varied input method  for the user to interact with the application program .

4. Deployment technologies : JRE comprises  the following key deployment technologies 
< Java plug-in : Enable the execution of a java applet on the browser.
< Java Web Start: Enables remote-deployment of an application with web start user can launch  an application directly from the web in the browser without going the installation procedure. 
         

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