1. AP Computer Science
Welcome

2. Learning Targets Understand classroom expectations
Be able to set up folders for class projects
Be able to create a Java project and classes within the project
Be able to write a class
Understand and be able to use escape sequences to format output.
Be able to write a program from Scratch in Java

3. Successful Behavior Behavior/Discipline Plan:
Students are expected to be safe, responsible and respectful.
Students not following these expectations may expect: verbal warnings, removal from class pending conference, parent contact, or referral to administration.

4. To be successful in this course:
Stay focused and productive in the classroom
Excellent attendance
Let your projects, daily work, quizzes and tests display your best effort
Feel free to talk with me about your projects, questions, etc.

5. Computer Lab Rules No gum in class
No food or drink in the lab (except water with a lid at approved locations)
No headphones or music except on days selected by teacher
Absolutely no off-task Internet usage ( , games, chat, etc – anything other than class related)
Absolutely no off-task Computer usage (ask teacher permission to use equipment for anything other than class assignments)
Do NOT download any software (games, utilities, music, etc.)
Do NOT use any “chat” software
No CELL PHONE use in class without permission of Mr. Smith.

6. Materials Needed
Each student will need a Composition Book, spiral or a tabbed off section in your three-ring binder for notes and handouts.
Bring a pen or pencil with you everyday

7. Computer Science at West
Robotics Programming (RobotC) (One Semester)
VEX Robotics/Engineering
Computer Science I and II (Pascal) (One semester each)
AP Computer Science (Java) (One year)
Prepares students for the ‘A’ level exam
Advanced Computer Projects (One semester, can be taken repeatedly)
Developing original software
Robotics Projects
VEX Robotics Challenge (Mainly first semester)
Spring tech conference (Second Semester)/FTC/VEX If we make the finals.
Introduction to Engineering Design
Design process
2 D and 3D design by hand
3D design on computer (Inventor)

8. Class Overview: First Semester
Basic I/O
Math in Java
Decision construct
For loop
Java Docs and Strings
While
Do..while*
Random
Arrays of Primitives
Midterm
More Arrays
Sorting
Intro to Objects
Inheritance
Project
More OOP
ArrayList Class
Intro to OSI Networking model
Review and Final

9. Grading Policy Assignments Programs 10 points Quizzes: 25 points
Tests: 100 Points
Projects: 20 to 100 points
Final: 200 points or 20% of your grade, whichever is less.
Grading Scale
A .. 90%+
B – <90%
C – <80%
D – <70%
F .. Below 60%

10. Time to Log-on
User Name: Use the ‘ID Number ‘ from your schedule for your user name.
Password: Use your student ID number, also on your schedule to the left of your name, with a ‘.’ after it for your password. You will be asked to change your password on the first time you log in.

11. Log in and Create Class Folder
Log onto the network
Your log in number is on your student ID number
Your password is your First Initial Last Initial Birthdate.
Example
Susie Kalahan 1/1/2002
sk112002
Jose Mahindra 10/15/2001 jm
Open YourName Folder
In to top left of the desktop
Make a new folder called APJava
Keep your APJava Folder open

12. Creating Shortcuts 2) Double Click on ‘APJava’ Folder
1) Double Click on SMITH_GREG-Shortcut

13. Drag and Drop into your ComputerScience1 Folder.
Drag and Drop Into Your APJava Folder
Drop

14. Shortcut to Class Website
Click on ‘AP Computer Science’

15. Put Shortcut in your Folder
Drag and Drop

16. Syllabus
At home print out the syllabus, have your parents sign it and turn it in.

17. Find the Class Website, Find your Strengths
Smithcsrobot.weebly.com
Click on the Computer Science 1 Link
Click on ‘Find Your Strengths’
When complete Turn in a Word Document that includes:
Your Name
Class Period
Two + strengths
Any questions you have at this point in time
Anything that would help me teach you better.

18. Start a New Project (Folder)
Now Project…
2) ‘Choose’
Navigate to your APJava Folder

19. Navigate to APJava
Select Folder

20. 1) Name The Project. No Spaces
2) Click OK

21. Start with a capital letter.
Start a new ‘Class’
Start with a capital letter.
1) New Class

22. Double Click on the Class to edit

23. Delete info between the {} after the public class Welcome1
Fill in the Class
Enter your name, brief description of the program, the date and version 1.0.
Delete info between the {} after the public class Welcome1

24. Enter the following program in BlueJ.
First Program
Enter the following program in BlueJ.

25. Compiling the Program
Click Compile
Check for errors.

26. Right click on the class.
Running the Program
Right click on the class.
Select void main()
Click OK

27. Output Screen

28. Include your name in the file name
Turn in the .java file
Rename the java file to YourNameWelcome1 and turn in to the turn in folder.
Include your name in the file name

29. public class Welcome1 Begins the class definition of class Welcome1
Breaking down the code.
Begins the class definition of class Welcome1
Every program must include the definition of at least one class.
Class names begin with a capital letter
The class name must match the file name (Welcome1.java)
This is case sensitive
The file must have a .java extension (BlueJ should do this for you.)
Identifier rules
//Series of characters (letters, numbers, digit, _, $
//Must not start with a number
//Cannot be a reserved word (purple in editor)
Must describe what it is storing!
Java IS Case sensitive
Get out your notes.

30. { Same as BEGIN in Pascal
Marks the beginning of the main body of the class.
Needs to match up with a }
Indent between the {}

31. public static void main(String args[])
This is the starting point of every java application
(Main body of the program)
() after main indicate it is a method (Like a procedure)
Java classes usually contain more than one method
Exactly one of these methods must be called main and defined as above for the program to run.
Methods perform tasks and return information. Kind of like functions
void indicates that it will return nothing.
String args[] is required for the main's definition. More details later.

32. System.out.println("Welcome to Java programming!");
System.out is the standard output object for showing info in the command window
The stuff inside () are the arguments
System.out.println(); Displays the arguments and returns to the next line
Like writeln() in Pascal
"Wel..." This is a String of characters, message or string literal.

33. Comments and Common Errors
When successfully compiled it creates a Class file for Welcome1 called Welcome1.class
This file contains the byte codes that represent this application
Some common errors
"bad command or file name", "javac: command not found", ""'javac' is not recognized as an internal or external command, operable program or batch file"
Try: The system's path environment was not set properly. Check java.sun.com/j2se/5.0/install.html
“Public class ClassName must be defined in file called ClassName.java"
Try: Checking that the file name exactly matches the class name.

34. Describe the following
Review
// Mr. Smith // First Program // Today’s date public class Welcome1 { //main method begins execution of Java application public static void main(String [] args) { //The start of the method System.out.println("Welcome to Java programming!"); }//End of method main } //End of class Welcome1
Describe the following

35. More on System.out public class Welcome1 {
//main method begins execution of Java application
public static void main(String [] args)
{ //The start of the method
System.out.print("Welcome to "); //Stays on the same line
System.out.println(“Java programming”);
}//End of method main
} //End of class Welcome1

36. Showing Multiple lines
public class Welcome1 { //main method begins execution of Java application public static void main(String [] args) { //The start of the method System.out.println(“Welcome \nto \nJava \nprogramming”); }//End of method main } //End of class Welcome1

37. Escape Sequences \ is an ‘escape’ character
Some Common Escape Sequences
\n for new line
\t horizontal tab
\r Carriage return, but on the same line
\\ used to print the \character
\” Used to display “

38. Displaying Formatted Text (printf)
public class Welcome1 { public static void main(String [] args) { //The start of the method System.out.printf(“%s\n%s\n”,"Welcome “,” to Java programming!"); }//End of method main } //End of class Welcome1
System.out.printf(Format String, Comma separated data to display)
Format String
Can contain fixed text, escape sequences and format specifiers
Format Specifiers: Begin with %
%s is a place for a string.

39. System.out.printf( “format-string” [, arg1, arg2, … ] );
Composed of literals (String characters) and format specifiers (%d, %-,.2f)
Arguments are required only if there are format specifiers in the format string. Format specifiers include: flags, width, precision, and conversion characters in the following sequence:
% [flags] [width] [.precision] conversion-character ( square brackets denote optional parameters )

40. AP Java: What do you recall about…
System.out.println();
public static void main (String [] args) { }
System.out.printf(“%s”, “Hello World”)
\n (%n also) %d %f %s

41. Flags
% [flags] [width] [.precision] conversion-character ( square brackets denote optional parameters )
Flags:
- : left-justify ( default is to right-justify )
+ : output a plus ( + ) or minus ( - ) sign for a numerical value
0 : forces numerical values to be zero-padded ( default is blank padding )
, : comma grouping separator (for numbers >= 1000)
: space will display a minus sign if the number is negative or a space if it is positive

42. Width
% [flags] [width] [.precision] conversion-character ( square brackets denote optional parameters )
Specifies the field width for outputting the argument and represents the minimum number of characters to be written to the output.
Include space for expected commas and a decimal point in the determination of the width for numerical values.

43. Precision
% [flags] [width] [.precision] conversion-character ( square brackets denote optional parameters )
Used to restrict the output depending on the conversion.
It specifies the number of digits of precision when outputting floating-point values . Numbers are rounded to the specified precision.

44. Common Conversion Characters
% [flags] [width] [.precision] conversion-character ( square brackets denote optional parameters )
d : decimal integer [byte, short, int, long]
f : floating-point number [float, double]
c : character Capital C will uppercase the letter
s : String Capital S will uppercase all the letters in the string
n : newline Platform specific newline character- use %n instead of \n for greater compatibility

45. Examples
% [flags] [width] [.precision] conversion-character ( square brackets denote optional parameters )
System.out.printf("Total is: $%,.2f%n", dblTotal);
, ->Comma Separated
.2 ->Two digits to the right of the decimal
f -> Floating point notation (real value)
n -> Returns to the next line
dblTotal -> The variable whose value will be displayed
System.out.printf("Total: %-10.2f: ", dblTotal);
- -> Left justified
10 -> 10 Spaces for displaying the value
.2 -> Two digits to the right of the decimal
System.out.printf("% 4d", intValue);
Space -> Will leave space if positive or a – if negative
4 -> At least four spaces for displaying the value
d -> Showing an integer value.

46. More Examples: Controlling integer width with printf
The %3d specifier means a minimum width of three spaces, which, by default, will be right-justified
printf("%3d", 0);
printf("%3d", );
printf("%3d", -10);
-10
printf("%3d", );

47. Left-justifying printf integer output
To left-justify integer output with printf, just add a minus sign (-) after the % symbol, like this:
printf("%-3d", 0);
printf("%-3d", );
printf("%-3d", -10);
-10
printf("%-3d", );

48. The printf zero-fill option
To zero-fill your printf integer output, just add a zero (0) after the % symbol, like this:
printf("%03d", 0);
000
printf("%03d", 1);
001
printf("%03d", );
printf("%03d", -10);
-10
printf("%03d", );

49. printf integer formatting
As a summary of printf integer formatting, here’s a little collection of integer formatting examples. Several different options are shown, including a minimum width specification, left-justified, zero-filled, and also a plus sign for positive numbers.
Description
Code
Result
At least five wide
printf("'%5d'", 10);
'   10'
At least five-wide, left-justified
printf("'%-5d'", 10);
'10   '
At least five-wide, zero-filled
printf("'%05d'", 10);
'00010'
At least five-wide, with a plus sign
printf("'%+5d'", 10);
'  +10'
Five-wide, plus sign, left-justified
printf("'%-+5d'", 10);
'+10  '

50. printf - floating point numbers
Description
Code
Result
Print one position after the decimal
printf("'%.1f'", );
'10.3'
Two positions after the decimal
printf("'%.2f'", );
'10.35'
Eight-wide, two positions after the decimal
printf("'%8.2f'", );
'   10.35'
Eight-wide, four positions after the decimal
printf("'%8.4f'", );
'  '
Eight-wide, two positions after the decimal, zero-filled
printf("'%08.2f'", );
' '
Eight-wide, two positions after the decimal, left-justified
printf("'%-8.2f'", );
'10.35   '
Printing a much larger number with that same format
printf("'%-8.2f'", );
' '

51. printf string formatting
Description
Code
Result
A simple string
printf("'%s'", "Hello");
'Hello'
A string with a minimum length
printf("'%10s'", "Hello");
'     Hello'
Minimum length, left-justified
printf("'%-10s'", "Hello");
'Hello     '

52. Quick Review Starting a project in BlueJ Parts of your program
Open BlueJ
Select your workspace (Folder)
Project->New Project
Click on ‘Class’ to create a class
Double click on icon to edit the code
Parts of your program
public class FormattedPrint {
public static void main(String [] args)
{//The start of the method
System.out.printf("%s\n%s\n","Welcome "," to Java programming!");
}//End of method main }
Time to get started.

53. Your first programs Poem/Song: (YourNamePoem-Song)
Create or modify a poem or song to display from your Java Program.
You will need to incorporate at least one printf.
Check: Using printf (YourNameCheck)
No input
Display information on the screen for a check with your generous donation to the West Salem Robotics Club.
ASCII Art
Using print, printf and println create a simple ASCII art image.