SimpleExample/assignment.txt

0. If you haven't done it:
   Create a directory in your dir space and copy
   the SimpleExample/*.java files into it.
     mkdir yourDirName
     cp /users/rlr/Courses/530/Src/SimpleExample/*.java yourDirName
     cd yourDirName
   where you put whatever you want for 'yourDirName'.

1. Follow the instructions at the top of the HelloWorldMain.java
   file to compile and run it.

2. Introduce some typical errors into the program HelloWorldMain.java
   and recompile after each one, to see what the error messages look like. 
   (After you see the error msg, change it back!)   For instance:

   First try to run it like these:
      java HelloWordMain
      java HelloWorldMain.class
   It can't find the class with a main() to start the program.

   In HelloWorldMain.java --
   a. change   public class HelloWorldMain
      to       public class HelloWorldmain

   b. change   Bug	aBug0, aBug1, aBug2; 	
      to       Buf  aBug0, aBug1, aBug2;    // Bug to Buf

   c. change   Bug	aBug0, aBug1, aBug2;
      to       Bug	aBug0, aBug1, aBug2     // note no semicolon ; at the end!

   d. Change:  System.out.printf(  
      to       System.out.printF(           // note cap F

   e. Change   aBug0.sayHello();
      to       aBug0.sayhello();            // note lowercase h

3. Compile and run the Main.java and Ant.java files.

4. Introduce some typical errors into the program HelloWorldMain.java
   and recompile after each one, to see what the error messages look like. 
   (After you see the error msg, change it back!)   For instance:
 
   a. In the loop creating the ants, 
      Change:    for ( int i = 0; i < numberOfAnts; ++i ) {
      to         for ( int i = 0; i < numberOfAnts; ++i ) 
      (no { at the end of that line).

   b. At the end of that same loop, remove the } .

   c. Add this loop at just before the while loop:
		for ( Ant a : antList ) {
			a.setX( rng.nextInt( 63 ) );
            a.setY( rng.nextInt( 63 ) );
        }
      why doesn't this work?   Fix it by changing Ant.java !
 
   In Ant.java --
   d. In the first constructor, remove the closing } .

   e. For this method definition starting line:
         	public double doSomething ( int i ) {
      - remove the double
      - change the double to void



2. Add a new class to the program:
   name:                 Chip
   Instance Variables:   ID, x, y, density
   Create a couple of constructors.
   Create the setters/getters.
   Create a printSelf method, to print its IVs.
   Create a method
      incrementDensity( double d )
   that causes the density to be increased by the 
   value passed as the d parameter.
   Change the instructions at the top of Main.java
   on how to compile the program to include this one.
   Then compile it, and run it.
   (Presumably it will run the same, since so
    far you have just defined the new class, not used it.)

3. Add a new ArrayList to Main.java
     chipList
   to contain Chip objects.

4. Create 10 chips, add to that list.
   Assign densities and x,y in some interesting way.

5. Use a for-loop to send the printSelf() message
   to all the Chips on the list.

6. Use the incrementDensity(d) method to change the
   density of a selected set of the chips, e.g.,
   the ones with odd IDs, with density < some value, etc.
   Print the list again after sending them all
   this message, to confirm it worked.