Using CodeWarrior

Creating a HelloWorld.java program

This example is intended to get you started with CodeWarrior. This example assumes that you are working from CDF-PC on campus; if you are working from home, you'll probably want to use C: instead of H: for the hard drive. The instructions for invoking CodeWarrior are also different if you're working from home.

This document contains details about how to create a Java program from scratch, or how you can include existing Java files (files that have already been created and exist on your hard drive). All steps are the same for these two tasks, except for step 4. Step 4 (a) explains how to create a new Java program, and step 4 (b) explains how to include existing Java program files. In this example, we assume that the Java program will be contained in a single Java file called HelloWorld.java. We will also name our project HelloWorld.

1. Invoke CodeWarrior
   
   
   • If working from CDF-PC, double click on the "Applications" folder which will be showing on your desktop, and then double click on the "CodeWarrior" icon.
   • If working from home, select Start -> Programs -> CodeWarrior Pro 5 -> CodeWarrior IDE
   
   
   
2. Create a new project
   
   
   • To open a new project, select File -> New...
   • Click on Java Stationary
   • Project name: HelloWorld
     (We are using the name of the class containing the main method.
     Alternatively, we could use the name of the folder where your files are stored.)
   • Location: H:\java\HelloWorld
     (Choose a folder/directory that you have write permission on. Your files for this program will go here. If the "java" folder does not already exist in your H: drive, you will need to click on "Set...". This will bring up a "Create New Project..." window. Change "save in:" to H: and then click on the yellow Create New Folder icon and type in "java" and then click "Open" and then click "Save."), and then click OK.
     [Notice that whatever name you choose for Project name will always be the last part of your Location.]

     [Note that we could have simply used a Location name of H:\HelloWorld. Having the "java" directory, however, helps to organize things better on your harddrive. This is especially helpful if you are working from home and have several other folders already on your hard drive.]

   • Click on the "+" next to Java2 to open it up, and then select Csc 1.0, and click on OK. This will bring up a HelloWorld.mcp window.
   
   
   
3. Tell Java where main method is
   
   
   • Select Edit -> Java Application Settings...
   • Click on Java Target (under the Target settings)
   • Main Class: HelloWorld
     (change TypeYourMainClassHere to be the name of your class containing the main method).
   • Click on Save, and then close the window by clicking the "x".
   
   
   
4. Include Files - create or open Java files
   
   
   • Click on Sources in the HelloWorld.mcp window to highlight it. This ensures that the file you add or create will be put into the Sources folder.
   • (a) Create new Java file
     • Select File -> New Text File
     • Type in this simple program into the empty window:

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

     • Now save the file, using HelloWorld.java as the filename. Select File->Save As and type HelloWorld.java for the filename.
   • (b) Add existing Java file
     • Use Windows Explorer to copy the files from your Handouts directory (or from wherever) into directory H:\java\HelloWorld. More details about using Explorer are provided in the section at the end of this document.
   • For both part (a) and (b)...
     With Sources still highlighted, click Project -> Add Files... and select the HelloWorld.java file in the H:\java\HelloWorld directory. (If desired, more than one file could be selected by holding the CTRL key and left clicking each file).
   • The HelloWorld.java file will automatically be added to Sources in your HelloWorld.mcp window. If you don't see it there, click on the various tabs in this window (Files, Link Order, Targets) to cause it to refresh.
   • Click on the "+" next to Sources, and you will see the files that are part of this program. Double click on your ".java" file to bring up a window that will allow you to view or edit it.
   
   
   
5. Compile
   
   
   • Select Project -> Make. Any compile errors will come up at this time. They will indicate the line number that has a problem.
   
   
   
6. Run
   
   
   • Select Project -> Run. The output will come up in an MS-DOS window. Any input for the program would be entered here. Press Enter in this window when the program has finished.
   
   
   
7. Closing CodeWarrior
   
   
   • Select File-> Exit to leave CodeWarrior. Your project will be saved.
   
   
   
8. Reopening a Project
   
   
   • Suppose you want to modify the HelloWorld project the next time you use CodeWarrior. You would start up CodeWarrior as outlined in step 1, and then you would select File -> Open... An Open window will pop up. You will change the directory in this window until you get to H:\java\HelloWorld, and then you will open the HelloWorld.mcp file. It stores all the information about your project.
   • Another way of reopening a project is to locate the project's HelloWorld.mcp file from within Explorer, and then you can double click on it. This will start up CodeWarrior, and take you might into that project.

Using Windows Explorer

In step 4 (b) it talks about using Windows Explorer to copy files from one directory to another on your computer. It should be noted that this application is not part of CodeWarrior. You can minimize your CodeWarrior application (by clicking on the minus sign at the top right corner of CodeWarrior), and then start up and run a Windows Explorer session as follows: