CS1371 Introduction to Computing for Engineers

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CS1371Introduction to Computing for Engineers

• Java Development Environments

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The Java Language

• Writing your first Java program
• Using JCreator
• Using NetBeans
• Using Eclipse

Learning Objectives The old way to program in
java. Understanding the environment in which you
will write Java code
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The Old Way

• Eclipse, JCreator, and NetBeans all provide one
  key concept. They provide an environment where
  you can edit, compile, and run your Java programs
  in one place. Do not take them for granted.
• The old-fashioned way is a real pain.
• The old-fashioned way involved typing your
  program in a text editor than going over to the
  command line to compile and run it.
• This is called Command Line Programming.

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Command Line Programming

• First you had to code and edit your program in
  the text editor of your choice and remember to
  save your file in the form of SomeClass.java.
• Then you must go to the command line (hence
  Command Line Programming) and set the Path for
  your Java Virtual Machine if you have not done so
  already.
• Then compile your program by typing
• javac SomeClass.java
• If you had errors you must go back to your editor
  fix and resave your file, which can be a pain.
• Once all errors are gone you will get a file
  called SomeClass.class.
• Once that happens you can type java
  SomeClass.java and observe your output.

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Command Line Programming
First Set the Path
Then Compile your File by typing javac
You then get your class file
Then type java to run and view out put
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General Concepts

• JCreator, Eclipse, and NetBeans use the
  following concepts to manage the files for a
  project
• A Workspace in which multiple projects are stored
• A Project in which multiple files are stored
• Source files with the extension .java containing
  human-readable program statements
• created by you in an editor
• Class files with the extension .class containing
  machine-readable program logic
• Created by the Java compiler

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The Java Language

• Using JCreator
• Using NetBeans
• Using Eclipse

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JCreator Implementation

• JCreator permits you to maintain multiple
  workspaces, each containing multiple projects
• The workspaces have the extension .jcw, and are
  found in the root directory where you opened the
  workspace.
• You may never need more than one per class.
• Projects have the extension .jcp, and are usually
  located with the Java files in sub-directories
  below the workspace.

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Obtaining JCreator

• JCreator must be installed in two stages
• Obtain the java Software Development Kit (SDK)
  from the sun web site
• http//java.sun.com/j2se/1.4.2/download.html
• Select the link to Download J2SE SDK and follow
  the directions using default answers wherever
  possible.
• Obtain JCreator itself from
• http//www.jcreator.com/download.htm
• Select the link to Download JCreator LE Version
  and follow the directions.
• As part of the installation process, JCreator
  will search your system for the right Java SDK.

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JCreator your first program

• When JCreator first starts, you see this view

Choose File New Blank Workspace
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JCreator creating a Workspace
Enter the name of the workspace
Browse for its location
Finish
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JCreator creating a Project
Right click on the workspace and select Add new
Project
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JCreator creating a Project
Choose Empty Project
Choose Next
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JCreator creating a Project
Enter the name of the project
JCreator sets default locations for the java and
class files
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JCreator creating a Program
Right click the Project
Select Add New File
Select Java File
Enter the class name
Browse for the location
Finish
Select Next
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JCreator writing a Program
Type the program
Click here to compile the program
When error free, click here to run the program
Any errors will be announced here
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JCreator program output
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Questions?
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The Java Language

• Using JCreator
• Using NetBeans
• Using Eclipse

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NetBeans Implementation

• NetBeans permits only one workspace
• Its default location is hidden somewhere in
  youre My Documents folder
• Multiple projects in that workspace are
  controlled by a Project Manager.

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Obtaining NetBeans

• NetBeans can be installed in one simple
  operation
• Obtain the integrated Netbeans and java Software
  Development Kit (SDK) from the sun web site
• http//java.sun.com/j2se/1.4.2/download-netbeans.h
  tml
• Select the link to Download and follow the
  directions using default answers wherever
  possible.
• As part of the installation process, NetBeans
  will connect to the right Java SDK.
• Mac OS users will need to separately install
  the java SDK and Netbeans similar to the JCreator
  procedure.

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NetBeans creating a Project

• When NetBeans first starts, you see this view

Choose Project Project Manager New
Enter the name of the project
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NetBeans accessing files
Right click in Filesystems
Make sure the Filesystems tab is selected
Select Mount Local Directory
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NetBeans creating a Project
Right click on the workspace and select new
Project
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NetBeans creating a Project
Choose Empty Project
Choose Next
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NetBeans creating a Project
Enter the name of the project
Hit Finish
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NetBeans writing a Program
Click here to compile the program
Type the program
When error free, click here to run the program
Any errors will be announced here
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NetBeans program output
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The Java Language

• Using JCreator
• Using NetBeans
• Using Eclipse

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Eclipse

• Eclipse is an advanced IDE with many professional
  capabilities.
• Eclipse will point out any errors that you will
  have while you code which makes error checking
  easy.
• Eclipse is supported on many different platforms.
• Eclipse will permit only one workspace.

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Eclipse

• Eclipse can be installed easily, but you must
  have a SDK installed first because eclipse will
  look for it on your computer.
• Go to http//www.eclipse.org/downloads.index.php
  
• Download the latest version(3.0). Try using one
  of the mirrors they have listed. If you cannot
  get a good connection go to the link that says
  main download site and download it from there and
  place it somewhere on your computer where you
  find it later.
• Go to where you saved your download and extract
  the files to a location of your choice for
  example C\eclipse. Mac users install by copying
  the entire folder to /Applications directory. Now
  for easy access right click on the eclipse icon
  and create a desktop shortcut.

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Eclipse Creating a Workspace

• Creating a workspace is easy.
• Right click on your desktop icon and select
  properties.
• In the target textfield type C\eclipse\eclipse\e
  clipse.exe -data C\workspaces\cs1371
• Hit apply and then ok.
• Your workspace is set up.

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Eclipse New Project
Click here (the new button)
Select Java Project
Hit Next
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Eclipse New Project (Continued)
Enter the Project Name
Hit Finish
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Eclipse Adding Files
Right-click on the project you just created and
select new
Select Class
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Eclipse Adding Files (cont.)
Type the name of the class
Hit Finish
Check public static void main(String args)
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Eclipse Creating a program
Type your code here
Hit the arrow and select run as a Java application
Output will be generated here
If there are any errors they will be generated
on the side, next to the line that caused the
error, indicated by a red X. If you hover over
the X with your mouse it will tell you whats
wrong.
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Summary

• Eclipse, JCreator, and NetBeans provide stable
  development environments for Java programming.
• Concept of a Workspace (NetBeans has only one)
• Concept of a Project
• Differences in philosophy
• JCreator is all-inclusive by default
• If you create a new project in a directory
  containing java files or sub-directories with
  java files, it presumes they are all included in
  the project
• NetBeans Eclipse are exclusive by default
• You must explicitly mount a file system for a
  project, and then import java files into the
  project
• Eclipse and NetBeans provides significantly more
  professional support
• Javadoc access and autocompletion
• Debugging with break points etc. (available in
  paid versions of JCreator)

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Questions?
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