Exercise 05: A Better Notebook

This week’s lab work is intended help you practice using loops.

Pre-lab

P0. Write a loop on paper that prints out all multiples of 5 between 10 and 95.

P1. Write a method called sumBetween that adds up all numbers between two numbers, a and b, that are passed into the method as parameters. Include a but not b in the sum.

P2. Assume you have a collection of students called imi1. The Student class has a method getFirstName and a method getSurname. Write a loop that prints out all students in the collection with the last name first, then a comma, then a blank, and then the first name, each on a line by itself.

P3. Write a method isPrime that uses a while loop to test if a number given in a parameter is prime or not. A number is prime when it is divisible with a remainder of 0 only by 1 and itself.

What To Turn In

Please hand in:

zip-folder with your prelab-and-primes project and the Notebook project.
Your lab report as a pdf. For more Information on the report see the Labs and Exercises page.

Lab assignments are due on the day before the next lab at 10pm.

Assignment

Part 1: A Better Notebook

Source Code for this exercise: https://github.com/htw-imi-info1/exercise05

You can use the notebook-gui project which should ease testing. The Notebook.java file stays the same. If you use the GUI version you should start by adding the method signatures with empty method bodies or returning a simple value (e.g. “”, null, 0) where necessary (or you could return “not yet implemented”) until NotebookGUI compiles, enabling you to start using the GUI for testing. You can, however, just use Notebook.java.

Using the provided class PreLab in the prelab-and-primes project, test that your prelab work in P0-P1 is correct. What test cases did you have to create?
printAll(): Adapt the notebook project you find in the repository to list all notes in a method called printAll(), as done in class. Create a notebook and add some notes, checking that this method works as intended.
getAll(): Now copy the method, name the copy getAll() and modify such that instead of printing all notes directly, it returns a string containing all notes with a new line ( “\n” ) in between. If you don’t like the idea of copying code rewrite the printAll() method to use getAll().
getAllNumbered() : copy and modify your getAll() method so that it adds a number in front of each note that corresponds to its index in the ArrayList. The new method should be called getAllNumbered().
getNotesWith(String searchString): implement a search method that returns a string with all the notes containing the search string, separated by “\n”.
removeNote(String searchString): Implement a Method removeNote() that removes all notes containing a searchString passed as parameter (as seen in class) by using an iterator and the remove() of the iterator method. The removeNote method returns nothing; it modifies the notes collection.
removeNotesWithIndex(String searchString) Implement a second remove method without an Iterator but using the indices of the notes. The removeNoteWithIndex method returns nothing; it modifies the notes collection. Did you run into problems? If not, what may be the possible problems with this compared to the solution using an iterator?
Within a single execution of the two remove methods, the notes collection is asked repeatedly how many notes it is currently storing. Does the value returned by size vary from one check to the next? Rewrite your remove method so that the size is not checked unnecessarily, perhaps using a local variable. Check that your version gives the same results! What cases will you have to test?
Create a collection primes and use your pre lab exercise 3 to fill it with the prime numbers between 1 and 1000. Oops, this won’t work directly, because collections don’t take ints. You can use something called autoboxing to solve this. Look up Integer in the API and use this. How many prime numbers are there between 1 and 1000? Please use the method primesSmallerThan(int number) in the PreLab class for this, and have it return the number of primes you’ve found. There is also a method stub for isPrime already in the class.
(For the bored) Implement a search with ‘?’ as a joker standing for any character, and ‘*’ standing for any number of characters.
(For the really bored) Implement full regular expression search for the notebook.

Part2: Kara

Kara in the Tunnel

(kara/kara-tunnel): Kara is afraid of Tunnels. When entering the tunnel, Kara is scared and drops one leaf; then she walks through the tunnel (without dropping further leaves) and immediately stops after leaving the tunnel. Note that “in the tunnel” means that there is a tree on both sides, not just on one. Provide a general solution and Test it with both Worlds in the scenario.