Toll Free 800 Numbers Java Javax: define|definition|types|list of packages in java with example|programs what are the advantages and disadvantages simple|pdf|ppt

Thursday, 24 January 2013

define|definition|types|list of packages in java with example|programs what are the advantages and disadvantages simple|pdf|ppt


packages in java packages in java with example packages in java ppt advantages of packages in java
types of packages in java list of packages in java definition of package in java packages in java with example programs packages in java tutorial advantages of using packages in java what are the advantages of packages in java what are the advantages and disadvantages of packages in java definition of package in java simple definition of package in java define a package in java packages in java pdf

    Packages:

           In general to learn any kind of language we have to learn the library effectively. In 
     order to learn c language, we have to learn its concepts, syntax and library. Library of c    
     language is collection of predefined  header files. The header file is collection of predefined 
     functions. In c software development, if any function used by many number of programmers 
     then those functions are known as common functions and they must into a header file.
     In general header files of c, cpp contains common functions which are meant for common 
     access.
       Similarly in order to learn java language we have to learn its concepts, syntaxes, oops  
    features and API.

   API Definition:
                    An API is a collection of packages.

   Definition of package:
                  A package is collection of classes, interfaces and sub packages. A sub package in terms contains collection of classes, interfaces and sub-sub-packages etc….

  Advantages of Packages:
     If we develop any application by using the concept of packages then we get the following advantages.
1)      Application development time is very less.
2)      Application execution time is very less.
3)      Application performance is enhanced or improved.
4)      Application memory space is less.
5)      Redundancy of the code is minimized, so that we can get consistent result and reduced memory cost.

Disadvantages of Packages:
1)      In packages concept we cannot pass parameters to packages.
2)      Modification in a function or variable value needs to be reflected in all the functions that use the changed function and hence the whole package needs to be recompiled.

Difference between inheritance and Package ?

a)      The concept of inheritance makes us to understand how to inherit the features within the program between class to class, interface to interface and interface to class but not across the programs.
b)      Concept of packages makes us to understand how to reuse the features with in programs and across the programs between within the programs and across the programs between class to class, interface to interface to interface and interface to class.

Types of packages in java
1)      Predefined packages.
2)      User defined packages.
3)      Third party packages.
        
           1)      Predefined Packages:
                 Predefined packages are those which are developed by sun micro system and 
            supplied as a part of jdk to deal with universal requirements.

     List Of predefined packages
    Predefined packages are classified into three types they are
i)   Jse  (core)  packages.
ii)  Jee (advance) packages.
iii) Jme (advance) packages.

            List of Some JSE packages:
a)      Java.Lang.*;
b)      Java .awt.*;
c)       Java.Applet.*;
d)      Java.Net.*;
e)      Java.util.*;
f)       Java .text.*;

        2)      User defined packages:
                 User defined packages are those which are developed by java programmer and 
           supplied as a part of their project to deal with common specific requirements.

       3)      Third Party Packages:
               Third party packages which are developed by third party software vendors(oracle, ibm  
          , apache etc….) ant they are used for dealing with third party software's by the java 
          programmers.



No comments :

Post a Comment

LinkWithin

Poll