Comp 110 Recitation 1 Java Installation

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Comp 110Recitation 1Java Installation

• Instructor Sasa Junuzovic

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Agenda

• Questions
• Announcements
• Software Installation
• Bare-bone environment
• Running the First Java Program

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Announcements

• Honor Code Pledge
• Check Assignments on Blackboard to sign the
  Pledge
• Office Hours
• M 430-530, Th 200-300
• Or by appointment
• Class Notes
• Now available for Theater Model of a Computer
• LiveMeeting
• Access to Live Meeting and the recordings will be
  available to you
• Assignment 1 handed out today

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Software Installation What do we Need?
Use basic text editor such as Notepad
Source Code
In Java, this requires running javac
Compiler
We will use two other tools for now
Console Window Command Prompt
Platform Independent Intermediate Code
ObjectEditor Driver
Interpreter
In Java, this requires running java
Platform Specific Machine Code
Processor
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Software Installation

• For those of you who were in class on Friday Aug
  24, 2007
• If you were able to bring successfully load the
  ObjectEditorComp110 program (shown below) then
  your installation is complete. You do not have to
  go through the rest of the slides in this
  presentation.

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Software Installation

• Assumption You have Windows XP and are using
  Mozilla Firefox to browse the Web
• There are separate instructions for Mozilla
  Firefox users and/or Mac users

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Java Installation

• Open the Following Website in Firefox
• http//java.sun.com/javase/downloads/

• Click the Download Button for JDK 6 Update 2

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Java Installation

• Select the Accept option to continue

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Java Installation

• Click on the Windows Offline Installation link

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Java Installation

• Click on Save File

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Java Installation

• File should have been downloaded to the location
  stated here

• In this case, it was downloaded to the desktop
• We assume that it was downloaded to your desktop
  from now on

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Java Installation

• When download completes, run the
  jdk-6u2-windows-i586-p.exe file
• On the first screen, press Accept

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Java Installation

• Press Next on the following screen

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Java Installation

• Press Next on the following screen

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Java Installation

• Uncheck the Show the readme file
• Click the Finish button

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Setting Up The Environment

• Click Start
• Right-click on My Computer
• Click on Properties

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Setting Up The Environment

• Select the Advanced tab

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Setting Up The Environment

• Click on Environment Variables

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Setting Up The Environment

• Find the Path variable in the list on the
  bottom of the screen
• Click the Edit button

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Setting Up The Environment

• At the end of the Variable value field, enter
  the following (including the quotes)
• C\Program Files\java\jdk1.6.0_02\bin

• Do not forget the at the start
• Do not forget the double quotes
• Click OK three times to get out of the windows
  you have opened

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ObjectEditor Installation

• Open up a command prompt window
• Click on Start, then Run
• Type cmd (excluding the quotes) and press Enter

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ObjectEditor Installation

• In the command prompt window, you will do three
  operations. Please keep in mind these two rules
• Rule 1 Do not enter any double quote characters
• Rule 2 Type the exact text shown below. In
  particular, the case must match, and pay
  attention to the / and \ characters as they
  mean different things.

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ObjectEditor Installation

• Operation 1
• In the command prompt
• Type cd \
• And press Enter
• The only text on the bottom most line should be
  C\gt

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ObjectEditor Installation

• Operation 2
• In the command prompt
• Type mkdir comp110
• And press Enter
• You should see C\gt on the bottom line and no
  errors

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ObjectEditor Installation

• Operation 3
• In the command prompt
• Type cd comp110
• And press Enter
• You should see C\comp110gt on the bottom line
  and no errors

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ObjectEditor Installation

• Go to the course webpage
• http//www.cs.unc.edu/sasa/teaching/fall2007/comp
  110
• Right-click on ObjectEditor
• Select Save Link As
• Save it to c\comp110
• To do so, follow the next four slides

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ObjectEditor Installation

• Click on My Computer

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ObjectEditor Installation

• Open up your C drive

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ObjectEditor Installation

• Open up comp110

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ObjectEditor Installation

• Click Save

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ObjectEditor Installation

• Go back to your command window, type dir and
  press Enter
• You should see oeall3.jar listed in the output

• If there is no oeall3.jar listed, then carefully
  re-download oeall3.jar from the course webpage.

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ObjectEditor Installation

• Go to the course webpage
• http//www.cs.unc.edu/sasa/teaching/fall2007/comp
  110
• Right-click on ObjectEditorComp110
• Select Save Link As
• Save it to c\comp110, just like you did
  oeall3.jar

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ObjectEditor Installation

• Go back to your command window, type dir and
  press Enter
• You should see oeall3.jar and ObjectEditorComp110.
  java listed in the output

• If either is missing, then carefully re-download
  the missing one from the course webpage.

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Compiling Your First Java Program

• Go to your command prompt window
• NOTE Make sure you are in the comp110
  directory
• You are if the text on the bottom line of the
  command prompt window contains exactly
  c\comp110gt
• If you are not in the comp110 directory, do the
  following
• Type cd \ in the command prompt window and
  press Enter
• Type cd comp100 in the command prompt window
  and press Enter

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Compiling Your First Java Program

• Compiling
• In the command prompt window, enter the following
  (excluding the quotes)
• javac -classpath oeall3.jar .java
• Press Enter

• There should be no errors reported. If there are
  check the slides at the end of the presentation
  which provide solutions to possible compile errors

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Running Your First Java Program

• Running
• In the command prompt window, type the following
• java classpath .oeall3.jar
  ObjectEditorComp110
• Do not forget the . just before oeall3.jar
• Press Enter and the following window should
  appear
• If there are errors in the command prompt window,
  see the slides at the end of the presentation for
  solutions

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Running Your First Java Program

• Finished
• Congratulations, you have successfully installed
  Java and ObjectEditor
• The remaining slides are only for handling errors
  encountered during the installation

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Problems and Solutions
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Possible Compile Errors

• If you get the following error message
• javac is not recognized

• Verify that the following folder exists
• C\Program Files\java\jdk1.6.0_02\bin
• You can use Windows Explorer to see if it exists
• If it does not exist, you must follow the steps
  for installing Java
• If it exists, then you must follow the steps for
  setting up the environment

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Possible Starting Errors

• If you get the following error message
• You must repeat the steps for Compiling Your
  First Java Program

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Possible Starting Errors

• If you get something similar to the following
• You need to re-download the ObjectEditor from the
  course webpage
• Make sure you download it to the c\comp110
  directory
• You can overwrite the one already in the directory

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Possible Starting Errors

• If you get the following
• Check the spelling of the command
• Make sure you have the correct case. Here,
  Objecteditorcomp110 should be ObjectEditorComp110

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Possible Starting Errors

• If you an error stating something about not being
  able to open a zip file, then please download
  oeall3.jar again
• You can overwrite the one you already have