1. Java External Libraries & Case Study26
Java External Libraries & Case Study

2. Previously
GUI Example
Switch project

3. Overview Java External Libraries & Case Study What is a library?
Internal
External
Required
Add External Libraries to Eclipse
Case Study

4. What is a library? A library is composed of reusable code
Saves time by
Providing code that performs a programming task
The code does not need to be designed and programmed again
Reducing validation of the code
The code does what it is supposed to
Reducing required tests
Providing efficient operations

5. What is a library?
Internal libraries are those provided as part of the language, e.g. java. and jaxax.swing packages
External libraries are those that have to be included in the language and at run time, e.g. SuperCSV
Public method and classes are accessible by all
Protected methods are accessible by inheritance (extends) and by the same package member classes
Protected methods are also accessible by package member classes

6. Required Required the .jar(s) files with the compiled code
A library must provide documentation, e.g. javadoc
Some time source files are also provided, normally for open source libraries

7. Add External Libraries to Eclipse
Download the library into your computer
Install the library, follow the library installation gudes
Open Eclipse
Select menu option “Window”
Select “Preferences” from dropdown menu
Open the “Java” option from the left hand side tree

8. Add External Libraries to Eclipse
Open the “Build Path” option
Select User library
Press “New” button (top right hand side)
Give a name to the library, use the library own name
Select the new library entry
Press “Add Jars...” button
Select the jar file(s)

9. Add External Libraries to Eclipse
Add link to documentation
Press “OK” button in the “Preferences” window

10. References Super CSV JFreeChart
Java library to read and write Comma Separated Values (CSV) files
JFreeChart
Java library to display charts