Using Java and BuggleWorld

Download the folder lab1 from the CS111 download directory, /usr/users/cs111/download on nike.wellesley.edu. Directions for using Fetch in CS111 are available.

Saying "Hi" to BuggleWorld

Using the overview of Code Warrior, run the project in that folder. What you will see is BuggleWorld, a special microworld we have created for CS111 students to have fun exploring programming ideas! Try clicking on a couple of buttons to see how BuggleWorld works.

Here's a quick summary of the most important buttons:

Run -- runs a program in BuggleWorld

Reset -- puts BuggleWorld back to its initial state
Reset must be hit before you can Run a program again.

Step -- Each press of Step executes (roughly) one line of the program. Step can not be used if the program has been Run unless BuggleWorld is Reset.

Also note that you can just play with the BuggleWorld options without running the program involved. You just need to create a new Buggle() before any BuggleWorld methods can be invoked.

Task 1: Write down the sequence of buttons which must be pressed to get "Hi" as shown above (the result of hitting the "Run" button).
Task 2: Study the file Hi.java in the project which is the code we've been observing. Check if it performs the same sequence of steps that you have come up with.

Jumping into CS

Now you're all ready to write your first program! The goal is to write "CS" as shown below.

For the first assignment we will just change the code that we have been given.

Task 3: Comment out the code that prints Hi, i.e. put comment symbols around it:
```
/*   
... code ... 
*/
```
Compile and run the program. Pressing Run on the BuggleWorld applet should cause no action (i.e. nothing is written and no buggles are created).
Task 4: Using the code that you have commented out as a sample, write code that writes CS. The best way to write a program is to write a few lines of code, then test it by running the program, then add another few lines, test, and so on. Try to make the picture exactly the same as shown above.

In the end of the class

Save your work either on a ZIP disk (better), or by uploading to your drop folder using Fetch. You can later use it as a reference. Make sure that you don't store your files on nike for too long -- when you get a chance, download them to your home computer or save them to a ZIP disk and remove from nike.

Run	--	runs a program in BuggleWorld
Reset	--	puts BuggleWorld back to its initial state Reset must be hit before you can Run a program again.
Step	--	Each press of Step executes (roughly) one line of the program. Step can not be used if the program has been Run unless BuggleWorld is Reset.