IB Computer Science II
From WLCS
Contents
- 1 Tuesday (11/24/09)
- 2 Friday (11/20/09)
- 3 Wednesday (11/18/09)
- 4 Monday (11/16/09)
- 5 Thursday (11/12/09)
- 6 Monday (11/9/09)
- 7 Thursday (11/5/09)
- 8 Monday (11/2/09)
- 9 Thursday (10/29/09)
- 10 Tuesday (10/27/09)
- 11 Friday (10/23/09)
- 12 Wednesday (10/21/09)
- 13 Monday (10/19/09)
- 14 Thursday (10/15/09)
- 15 Tuesday (10/13/09)
- 16 Thursday (10/8/09)
- 17 Tuesday (10/6/09)
- 18 Friday (10/2/09)
- 19 Archives
Tuesday (11/24/09)
Agenda:
- Dossier - Data Structures
- Media:CriterionB1_dataStructures.doc
- Demo your LinkedList AddressBook
- Create 3 new classes called ContactBinaryTreeNode, ContactBinaryTree, and ContactBTTestMain
- Convert the 3 given binary tree classes to use Contacts instead of ints
- Create and demo a BinaryTreeAddressBook
Homework:
- Demo BinaryTreeAddressBook - due (Tuesday 12/1/09)
- Dossier - Data Structures rough draft - due (Thursday 12/3/09)
Friday (11/20/09)
Agenda:
- Demo your LinkedList AddressBook. It should be able to do the following:
- add a Contact
- print list of Contacts
- find a Contact
- sort list of Contacts
- Re-Introduction to Binary Tree
- Create 3 new classes called ContactBTNode, ContactBinaryTree, and ContactBTTestMain
- Convert the 3 given binary tree classes to use Contacts instead of ints
Wednesday (11/18/09)
Warmup:
- What is the algorithm for a linear search?
- What is the algorithm for a selection sort?
- What is the algorithm for a bubble sort?
Agenda:
- int find(String fn, String ln) in the ContactLinkedList
- Add the find() option to your AddressBookMain and AddressBook
- find() in the AddressBook should use the ContactLinkedList's find() and then ContactLinkedList's getContact()
- void selectionSort() in the ContactLinkedList
- You should move the bubbleSort() into the ContactLinkedList and complete the method yourself
- Removing a Contact
- Add a remove option to your AddressBookMain
- Create a remove(String fn, String ln) method in your AddressBook
- In the method, use the ContactLinkedList's find() method to get the index of the Contact
- Check if the index is valid (not the error code), and if so, then use the ContactLinkedList's remove() method using that index
- Demo a completely working AddressBook
Monday (11/16/09)
Warmup:
- Open your Contact class and review the code
Agenda:
- Contact class review as a class
- Create a new class from your Node class and called ContactNode
- Do this as a class...quickly
- Create a new class called ContactLinkedList
- Do this as a class...quickly
- Convert your LinkedList to use ContactNode and call it ContactLinkedList
- Go through one or two examples as a class
- Be sure to test your ContactLinkedList
- AddressBook class review as a class
- Convert your AddressBook to use ContactLinkedList instead of an array
- Comment out the parts for find(), selectionSort(), and bubbleSort(). We will convert these later
- Be sure to test your AddressBook with LOTS of contacts
Homework:
- Complete the AddressBook conversion over to ContactLinkedList by Wednesday (11/18/09)
- Be ready to demo your AddressBookMain
Thursday (11/12/09)
Agenda:
- Abstract data types review
- Introduction to Binary Tree
- Demo your LinkedList
- Contact class review
- Create a new class from your Node class and called ContactNode
- Create a new class called ContactLinkedList
- Convert your LinkedList to use ContactNode and call it ContactLinkedList
- Be sure to test your ContactLinkedList
- AddressBook class review
- Convert your AddressBook to use ContactLinkedList instead of array
- Comment out the methods for find(), selectionSort(), and bubbleSort(). We will convert these later
- Be sure to test your AddressBook with LOTS of contacts
Monday (11/9/09)
Agenda:
- Turn in homework
- Demo DynamicQueue
- Introduction to Linked Lists
- Media:LinkedList.java
- Attributes: head, tail, size
- Constructors: default
- Methods:
- isEmpty() - returns true if the LinkedList is empty, and false otherwise
- void add(int num) - adds a new Node with num at the end of the LinkedList
- void add(int num, int index) - adds a new Node with num at the index specified
- There are FIVE different scenarios when you add a Node
- DRAW the before-and-after pictures for all FIVE secenarios
- int remove(int index) - removes the index-th Node and returns its data
- There are SIX different scenarios when you remove a Node
- print() - traverses the LinkedList and prints out each Node's data
- Create a main method to test out all the methods and scenarios of LinedList
Homework:
- Complete the LinkedList class and all its methods by the beginning of class on Thursday (11/12/09)
- Mr. Bui will give you his LinkedListMain on Thursday to test
Thursday (11/5/09)
Warmup:
- Draw the before-and-after pictures for adding a Node to an empty Queue (be sure to use head and tail!)
- Draw the before and after pictures for adding a Node to a non-empty Queue
- Draw the before-and-after pictures for removing a Node from an empty Queue
- Draw the before and after pictures for removing a Node from a non-empty Queue
Agenda:
- Return 1st Quarter Exams
- Dynamically-sized Queues
- Create a new class called DynamicQueue
- Test out your DynamicQueue using the original QueueMain file
- Introduction to Linked Lists
- Media:LinkedList.java
- Attributes: head, tail, size
- Constructors: default
- Methods:
- isEmpty() - returns true if the LinkedList is empty, and false otherwise
- void add(int num) - adds a new Node with num at the end of the LinkedList
- void add(int num, int index) - adds a new Node with num at the index specified
- There are FIVE different scenarios when you add a Node
- DRAW the before-and-after pictures for all FIVE secenarios
- int remove(int index) - removes the index-th Node and returns its data
- There are SIX different scenarios when you remove a Node
- print() - traverses the LinkedList and prints out each Node's data
Homework:
- Complete DynamicQueue!
- Draw the before-and-after diagrams (all SIX scenarios) for the LinkedList's remove() method
Monday (11/2/09)
Warmup:
- Assume that you have allocated memory for a new int array of 10000 elements. An int is 32-bits in size, and there are 8-bits in 1 byte. How many bytes of memory are you taking up?
- If there are 1024 bytes in a kilobyte, how many kilobytes are you taking up?
Agenda:
- Dynamically-sized Stacks
- Create a new class called DynamicStack
- What attribute must we keep track of when we talk about stacks?
- Create a Node reference for the most important stack attribute
- Implement push(int num) using Nodes.
- push() should not return anything
- push() creates a new Node with the num, and set the new Node's next reference to the top
- Don't forget to update the top to be the new node!
- Implement pop(), which should POP and return the value on top of the stack and update the top
- Implement top(), which should just return the value on top of the stack
- Implement isEmpty() which returns true if the stack is empty
- Implement print() which should print your entire stack
- TEST YOUR STACK USING MR. BUI'S STACK MAIN OR YOUR OWN MAIN METHOD
Thursday (10/29/09)
- 1st Quarter Exam
Tuesday (10/27/09)
Warmup:
- Pass in your Prototype Solution to Mr. Bui
- Given the following code, draw the memory diagram:
Node fun = new Node(42);
Node general = new Node (11);
Node a, b, c;
a = general;
b = a;
fun.next = b;
c = fun;
Agenda:
- Pass back Stacks quiz
- Prototype Solution peer review
- 1st Quarter Exam Review
- Java programming
- class construction
- methods
- components of the method header
- Stacks
- how they work
- operations: push(), pop(), top(), isEmpty()
- why we use them
- example uses
- Queues
- how they work
- operations: add(), remove(), head(), tail(), isEmpty()
- why we use them
- example uses
- Nodes and reference variables
- Memory diagram and tracing code
Friday (10/23/09)
Agenda:
- Object and References Review
- Node class
- Node references practice
Homework:
- Dossier - Prototype Solution rough draft due Tuesday (10/27/09)
Wednesday (10/21/09)
Warmup:
- Give 2 specific examples of when a queue should be used
- Identify the following parts in each of the method declarations: access type, return type, method name, parameters
- public int getSize()
- private String whatNot(String whatFor)
- public void print(int size, String stuff)
Agenda:
- Make-up stack quiz for people who were absent on Monday
- Demo your fixed Media:Queue.java by using Media:QueueMain.java
- Criteria for Success peer review
- Object and References Review
- Node class
- Node references practice
- Read through Media:CriterionA3_prototypeSolution.doc
- Begin working on your Prototype Solution. It will be due next Tuesday (10/27/09).
Homework:
- Dossier - Prototype Solution rough draft due Tuesday (10/27/09)
Monday (10/19/09)
Warmup:
- What does LIFO stand for?
- What does LIFO describe?
- When would you want a LIFO?
Agenda:
- Stack quiz
- Queues
- Fix Queue.java so that it works. You must fill in all the method bodies
Homework:
- Dossier - Criteria for Success rough draft due Wednesday (10/21/09)
- Turn in late assignments! Examples: AddressBook sorting, Problem Analysis, etc.
Thursday (10/15/09)
Warmup:
- Demo any missing work
- Finish adding bubble sort and selection sort to your AddressBook
- Hint1: You cannot simply compare Contacts, but you can compare their last names
- Hint2: You cannot sort the ENTIRE Contact array, you can only sort the ones that you have added
- Hint3: You should test our the sorting methods by adding a (s)ort option to your AddressBookMain
Agenda:
- Introduction to Data Structures
- Stacks
- Go through Media:CriterionA2_criteriaforSuccess.doc
- Begin working on your Criteria for Success. It will be due next Wednesday (10/21/09).
Homework:
- Stacks quiz on Monday (10/19/09)
- Dossier - Criteria for Success rough draft due Wednesday (10/21/09)
- Turn in late assignments! Examples: AddressBook sorting, Problem Analysis, etc.
Tuesday (10/13/09)
Warmup:
- Please complete this password request form
- What are the advantages and disadvantages of the binary search algorithm?
Agenda:
- Dossier peer review - Analysis of the Problem
- Demo any missing work
- Sorting & Searching Review
- Selection Sort
- Bubble Sort
- Linear Search
- Binary Search
- Examples of using the String.compareTo() method
- Fix Media:StringBinarySearch.java such that it uses binary search to find a String. Hint: You will be using the compareTo()
- Demo StringBinarySearch to Mr. Bui by the end of today.
- You should then add selectionSort() to your AddressBook class. It sorts your AddressBook Contact array by last name using the selection sort algorithm. You may assume that everybody will have a different last name.
- You should then add bubbleSort() to your AddressBook class. It sorts your AddressBook Contact array by last name using the bubble sort algorithm. You may assume that everybody will have a different last name.
- Demo the two sorting methods to Mr. Bui before Thursday.
- Read through Media:CriterionA2_criteriaforSuccess.doc
- Begin working on your Criteria for Success. It will be due next Wednesday (10/21/09).
Thursday (10/8/09)
Warmup:
- Given the array of integers: 3, 6, 2, 7, 9, 5, 2, 3
- Illustrate the bubble sort algorithm to sort the numbers
Agenda:
- Introduction to Linear Search
- Download Media:LinearSearch.java
- Fill in the commented parts of LinearSearch.java and demo a working linear search to Mr. Bui
- Linear Search performance evaluation
- What is the best case scenario? i.e. What is the minimum # of comparisons?
- What is the worst case scenario? i.e. What is the maximum # of comparisons?
- What is the average # of comparisons?
- Can we do better than a linear search?
- Introduction to Binary Search
- Assume sorted list
- Go to the middle point
- If the middle element matches the key, then the search is over
- If the key is less than middle element, go to the left (down), else go to the right (up)
- Repeat steps 2-4 until the key is found or when the left and right bounds pass each other
- Binary Search Demo
- Binary Search Demo2
- Media:BinarySearch.java
- Binary Search performance evaluation
- What is the best case scenario? i.e. What is the minimum # of comparisons?
- What is the worst case scenario? i.e. What is the maximum # of comparisons?
- What is the average # of comparisons?
- Binary Search Advantages & Disadvantages
Homework:
- 1st rough draft of Analysis of the Problem due Tuesday (10/13/08)
- Any missing assignments (e.g. AddressBook, SelectionSort, BubbleSort)
Tuesday (10/6/09)
Warmup:
- Upload AddressBook.java and AddressBookMain.java to SchoolWebLockers
- Demo SelectionSort.java to Mr. Bui
- Turn in your Dossier idea sentence
Agenda:
- Introduction to Bubble Sort
- Initialize the front to be the top or beginning of the array
- Now go to the bottom/end of the array
- Compare the two adjacent elements to see if they are in proper sequential order
- Swap the elements if they are out of order (bigger number to the left of smaller number)
- Move to the next pair of adjacent elements/numbers
- Repeat steps 3 and 4 until the smallest number has "floated" to the top/front
- After you traverse the entire array
- Move the front so that the sorted numbers are ignored
- Go back to the end of the array
- Repeat steps 2 through 6 for the unsorted part of the array
- Bubble Sort Animation
- Download Media:BubbleSort.java
- Fill in the commented parts of the BubbleSort.java file. Where there is a comment, you need to write code.
- Demo to Mr. Bui at the end of class or at the beginning of class tomorrow
- Introduction to Program Dossier
- Media:CriterionA1_problemAnalysis.doc
- 1st rough draft of Analysis of the Problem due Tuesday (10/13/08)
- Work on your Analysis of the Problem section
Friday (10/2/09)
Warmup:
- Swapping elements warmup
Agenda:
- Demo AddressBook class lab assignment and any other missing assignments
- Submit your AddressBook and AddressBookMain on-line to Mr. Bui's SchoolWebLockers
- Review Selection Sort
- Download Media:SelectionSort.java
- Fill in the commented parts of the SelectionSort.java file. Where there is a comment, you need to write code.
- Demo to Mr. Bui at the end of class today
- Introduction to Program Dossier
Homework:
- Complete your AddressBook class lab assignment AND Media:SelectionSort.java
- Have a 1 sentence description of your dossier ready at the beginning of next class