AP Tutoring Session – Strings

 Okay, this is the only way I'm going to prep.

Tomorrow, I am covering an AP Free Response question at our Super Saturday Tutorial Session.

It's called String Coder.  
I've pulled the things I think they need from the Quick Reference, String class, List and some code from the Grid World does a for each.

They get a String Coder class they can use.

They have to do the following:

I always have them write the return stuff first, as that will give some points.

    String result = "";

…

    return result;

Then I am going to have them figure out how to meet the post condition.

for (StringPart part : parts)

   {

    int start = part.getStart();

    int length = part.getLength();

       result += masterString.substring(start, start+length);

   }

Next they have to do:

Again, first we have to return an ArrayList of String Part:

ArrayList<StringPart> result = new ArrayList<StringPart>();

and

return result.

In the middle (instead of and).

They have to go through the word, searching the parts of the master string

while (word.length() > 0)

{

    StringPart part = findPart(word);   (they will find it according to the pre-condition)

    result.add(part);

    word = word.substring(part.getLength());

}

I'm going to have them give me the answers, I'm going to type the code in and see if it works.  If it doesn't, I'm going to have them debug it.

I do have code to try.

If we run out of time, I'll teach them how to program the XBox.  The other AP teachers will probably kill me.