Assignment 0 (Due 23 Jan 2004, 5 PM)

For your first assignment, please visit the Elements Lab in Painter Hall, room 5.38 on Friday, January 23, 2004 during the following periods: 9 AM to Noon or 1 PM to 4 PM.

You will do the following in the lab:

• Introduce yourself to the TA and/or Proctor in Painter 5.38.
  
  
• Obtain an account: Obtain the login ID and password for your Elements Lab account at the User Assistant's desk. No other UT account will work in the Elements Lab. Never share your account with anyone else. If you registered late you may not be in the system. Let the TA or Proctor know. Give them your name so that we have a record that you were there in the Lab. Only for this instance (not being in the system) you may turn in your assignment late.
  
  
• Successfully login to a computer in the Elements Lab.
  
  
• If you have not already subscribed to the mailing list now is a good time to do so. The instructions are in the syllabus and can be accessed from the class web site at http://www.cs.utexas.edu/users/mitra.
  
  
• Start BlueJ: On the lab PC, click Start button, then select Programs, and click on BlueJ. If you do not find it, do not hesitate to ask a TA or proctor.
  
  
• Create a Project: Go to Project -> New Project. In the File Name field, type your Username for the project name and click on the Create button. The Project window will open and you will see buttons on the left that say "NewClass", "Compile", etc. On the right, you will see a graphical window that contains a file object icon.
  
  
• Create a Class: Click on the New Class button. A New Class dialog box will open. Type "Hello World" in the Class Name field. Leave the class option selected and click OK. In the graphical window, you should now see a new object called HelloWorld. Double-click the HelloWorld object to open it. This is going to be your HelloWorld.java file. You have a template to work with, most of which you will modify for your purpose.
  
  
• Type in the HelloWorld program. It is not necessary that you understand all the terms in this program. It will be explained to you in class later. The purpose of this program is print Hello World! on the screen.

       public class HelloWorld
       {
          public static void main ( String [] args )
  	{
            System.out.println ( "Hello WOrld!" );
  	}
       }
       

• Save your Program: Go to Class -> Save to save this file.
  
  
• Header: You need to create a header for this file. These are some comments you put in the program to make the program more readable to you and identifies your work to the TA. The header will be commented out and needs to go before the main body of the program.

       /*
  	 File: HelloWorld.java
  
  	 Description: 
  
  	 Name: 
  
  	 UT EID: 
  
  	 Course Name: CS 303E
  
  	 Unique Number: 
  
  	 TA: 
  
  	 Date Created: 
  
  	 Date Last Modified: 
       */
  
       public class HelloWorld
       {
         ...
       }
       

• Once you have created your header, you can save your class again (Class -> Save). Always save your program after any changes. This avoids any loss of work.
  
  
• Compile: Click on the Compile button at the top of the file editing window. If there is an error, make sure you did not make any typos and try compiling again.
  
  
• Run your Program: Close the editing window so that you are back at the main window. Right-click on the HelloWOrld class (yellow box labeled HelloWorld) and select the "void main(args)" option. You will get a pop up box. Click OK. This will run your program and show you the output generated. If everything looks okay close the run window.
  
  
• You can find the saved file under the directory created for your project. Since your project was named using your username, then you should be able to find the file in the directory named by your username on the computer's hard disk (i.e. C drive). For example, it will probably be in C:\your_user_name. Make sure the file name that contains your Java source code is HelloWorld.java.
  
  
• Read the instructions to the Turnin Program: This is the link to the instructions to the Turnin Program http://www.cs.utexas.edu/users/mitra/turnin.html.
  
  
• Turn in your finished HelloWorld.java file according to the turnin instructions for CS 303E. The file should contain the following things:
  • The proper header
  • The java source code for the HelloWorld program
  Run the turnin program by going to the Windows Start menu and under Programs chose "Turn in assignment". You will ned to submit the HelloWorld.java file. Be sure to turn it into the correct folder - the section in which you are offically registered.
  
  
• For fun: If you are feeling adventurous, you can introduce syntatic errors in the code and see what the error messages are like.
  
  
• Close BlueJ: Make a backup of your HelloWorld.java file on your ZIP or floppy disk and then logout of the computer. Always do the BEFORE logging out, once logged out all your information is lost unless saved elsewhere.