CSC116: Introduction to Computing - Java

Transcription

1 CSC116: Introduction to Computing - Java

2 Course Information Introductions Website Syllabus Schedule Computing Environment AFS (Andrew File System) Linux/Unix Commands Helpful Tricks Computers First Java Program Text Editor Remote Access Java Download Intro to CSC116

3 Course Instructor: Instructors Mrs. Michelle Glatz, Office Hours: Tues/Thurs 5:00 6:00 in DAN 200 and by appointment used to set up appointments Support TAs: Varsha Gopal, Office Hour: Fridays 11am 12pm in Daniels 200 Brenden Lech, Office Hour: Wednesdays 5 6 pm in Daniels 200

4 Office Hours CSC116 Office Hours: We will use My Digital Hand during office hours to manage questions: You should have received an invite Please register now

5 Textbook Building Java Programs A Back to Basics Approach 4th Edition Reges and Stepp NCSU CSC Department, Style Guidelines

6 Course Website Moodle login page: Moodle Course Page (direct link) course materials submit coursework feedback returned grade book

7 Moodle Syllabus Link Syllabus Schedule Link Schedule In class exercise due before end of class Other lab exercises due on Sunday night Assignments due at 11:45 pm

8 Course Structure The course structure is a mixture of lecturing and practicing as we go through material. The idea is to reinforce the learning of new material with hands on experience using it right away.

9 Exercises In-class: Group assignments completed in-class. Similar to examples Lab: Apply new concepts. Due Weekly. Practice-It! Exercises: Every 2 chapters turn in list of problems solved as Homework (screenshot pdf: cntrl-p, capture your userid) create an account choose a problem from list Type a solution and submit it. The system will test it and tell you whether your solution is correct.

10 Programming Assignments There will be 6 programming projects in addition to the Lecture Exercises. MUST BE DONE INDIVIDUALLY!!

11 Academic Integrity Do your own work (projects) Don t copy from outside resources (don t google it!) Don t look at other student s code Don t show your code to another student See syllabus for violation penalties

12 Exams Two midterm exams One final exam Check the course schedule on our website for dates. Paper exams, closed book, closed notes, closed computer.

13 Message Board The course message board (Piazza) is a great place to ask questions and discuss topics with the Instructor, TAs, and all the other students in class piazza link The only rule is that you may not publicly post any code that directly comes from an assignment, but example code is permitted Make the question private if need to post your code. Post to Group 007 if specific to our section

14 Grading Minimum Grade Requirement Need a 73 to advance to CSC216 To earn a C- or higher you must: have an exam average of at least 60 AND have a project average of at least 60 Activity Weight Exercises: (.2 * In-class avg +.6 * Weekly Exercise avg +.2 * Practice-it! avg) Projects 30 Comprehensive Exercise 2 Exam 1 17 Exam 2 17 Final Exam 20 14

15 Regrade Requests The TA s will send out an to inform you when they have completed grading of each assignment. To request a regrade (within one week): Send an to the Teaching Staff support with Regrade Request as the subject line. group-csc116-glatz+007@ncsu.edu Include the name of the assignment and why you think it should be regraded.

16 Computing Environment Review of E115 topics that will be important for the course. The materials come from the E115 Textbook (

17 AFS AFS: Andrew File System Distributed file system used to organize files, which is used at NC State Personal home directory /afs/unity.ncsu.edu/users/y/yourhome /afs/unity.ncsu.edu/users/m/mlglatz

18 Handy UNIX Commands cd pwd ls mkdir cp mv rm rmdir

19 Traverse Directory Tree & Find Current Location cd: change directory pwd: print working directory Log on, open a terminal window, and try entering these command at the prompt: cd.. pwd pwd cd username pwd cd../../.. pwd cd ( or cd ~ ) pwd

20 What s in a directory? ls: list contents of directory Try it: cd /afs/eos.ncsu.edu/courses/csc/ ls ls -l cd ls -a ls al

21 Organize your CSC116 Files mkdir make directory Try it: cd mkdir csc116 cd csc116 mkdir exercises mkdir projects cd exercises mkdir Lab1 cd Lab1

22 Helpful Tricks/Shortcuts Up/Down arrows Recall previous commands Tab completion Completes commands/file names Ctrl + C to regain command prompt if system is hung up

23 What you will learn in CSC116 Problem solving the purpose of writing a program is to solve a problem Java programming language Concepts of Object-Oriented Programming (OOP) encapsulated collection of data variables and methods Documentation techniques Testing methods

24 Hardware Software Number Systems Base 10 (decimal) Base 2 (binary) Bits and Bytes Programming Computers

25 Hardware The physical components that make up a computer: CPU (Central Processing Unit) Executes program instructions (brains) Memory (RAM) Used to store current program and data Hard Disk Permanent data storage

26 Computer programs Operating System Software Bridge between hardware, programs, user Allocates memory and send instructions to CPU Applications Programs run within the operating system

27 Binary and Decimal Typically, we (humans) use the base-10 (decimal) notation. Uses the digits 0 through 9 All information is stored on a computer as binary numbers 1 s and 0 s (base 2) 10 (1 * * 2 0 ) = 2 base (1 * * 2 0 ) = 3 base (1 * * * 2 0 ) = 4 base-10

28 Binary (Base-2) Binary and Decimal Decimal (Base-10) ,000 1,

29 Convert between Decimal and Binary 20 Decimal to Binary (20 16 = 4, 4 4 = 0) Binary to Decimal = 28

30 Bits and Bytes Bit Binary Digit Byte 8 Bits Kilobyte (KB) bytes Megabyte (MB) ,048,576 bytes Gigabyte (GB) ,073,741,824 bytes

31 Programming Languages We can write a program using only 0s and 1s, but that has many disadvantages Hard to look at and understand Very tedious! We use a programming language instead - we write code in English instead of 0s and 1s, which is much easier to read and understand The code we write is interpreted by a program called a compiler, which translates our English into 0s and 1s for the processor to understand Java is the programming language we will use in this course

32 Computer Programming Algorithm - A step by-step description of how to accomplish a task. Program A list of instructions to be carried out by a computer. Computer Programming the art of designing and writing a group of instructions that the computer s processor executes.

33 Computing Environments Use Classroom/campus linux desktop computers During class, used for lecture demos Ensures that programs work on linux Connect Remotely to campus linux computers Work from home Need wifi connection Ensures that programs work on linux Work natively on your laptop Efficiently work at home No need for wifi Must transfer final files to afs and run using one of the other methods to ensure programs work on linux.

34 Windows: Remote Access Run X-Win32 and then run PuTTY. X-Win32 is a X11 Windows System that enables you to display a Unix or Linux application with a graphical user interface (GUI) on your Windows computer. PuTTY is a SSH client that gives you terminal access to run commands and command-line applications (make sure to enable X11 forwarding). Click on application to download Macintosh: Brings you to software download page There is a documentation/installation link for each application. Download and Install XQuartz: Run XQuartz then open terminal window Application Utilities Terminal ssh -X -Y your_unity_id@remote.eos.ncsu.edu

35 File Transfer Transfer Files between Your Laptop and AFS For the desired application: Click on supplication name Windows: Brings you to software download page Click on desired download Use FileZilla and/or WinSCP. Macintosh: Use FileZilla

36 Software You may download the Java 2 Standard Edition (J2SE) Software Development Kit (JDK) from Download JDK version 8u191, DO NOT download version 11. Text Editor Campus Linux Computers gedit (gedit filename & - opens in new window) Mac TextWrangler, Aquamacs Windows Notepad++

37 Configure Editor Configure to convert tabs to 4 spaces Materials/course-resources/style-guidelines-resources/text-editorspaces.html TextWrangler : Preferences->Editor Defaults->Auto-expand tabs Set tabs to 4 spaces restart TextWrangler for changes to take place Notepad++ : Settings->Preference->Language Set Tab size to 4 Check Replace by space box Gedit: gedit icon in the application bar (top of screen) Go to Preferences. Insert spaces instead of tabs

38 Java Download for Laptop The next set of slides show the java download and set up process. The current version on the download site is Version 11. We will be using version 8 The java version used for demonstration is version 8 update 152 (current version is 191) oads/index.html

39 Download Java Current Download is Version 11, don t download this one.

40 Download Java Page down to the following Version 8 downloads. Click on the JDK download

41 Accept Agreement

42 Installation Save the file to the desktop and run it Install to default location The installation screen should read (don't change it): Install to: C:\Program Files\Java\jdk1.8.0_152\

43 Installation

44 Install Directory

45 Setting the Path Windows Once the installer is finished, you must set your computer's path before Java will work correctly FOR WINDOWS ONLY Go to the Control Panel and double-click System Select the Advanced tab Click on the Environment Variables button Look under System Variables for "Path" Click on "Path" and then click edit Add the following to the end of the Path: ;C:\Program Files\Java\jdk1.8.0_152\bin Click OK.

46 Setting CLASSPATH - Windows Look to see if there is a variable named CLASSPATH If there is not, then Click the "New" button. For the variable name, type: CLASSPATH For the value, type:.; (that period semicolon) Click OK. Exit out of all the open windows

47 Installed Correctly? Open up a command prompt. On Windows: Open Command Prompt - On MAC OSX: Open the Applications folder, open the Utilities folder, then open the Terminal application. Type java and hit enter "command not found means java is not installed correctly list of options for running java means installed ok Type java -version and hit enter It should list version you installed (e.g _152)

48 Write Compile Execute A human writes Java code, known as source code (.java file) gedit HelloWorld.java & The Java compiler converts the source code into machine code or byte code (.class file) javac HelloWorld.java The computer has a Java Virtual Machine (JVM), which translates the byte code into instructions that the specific computer s processor can understand. java HelloWorld A.class file can be used on any computer that has a Virtual Machine, no matter what platform the class file was created on (platform independence) Output messages printed to the screen

49 Classic First Program Write a program that prints the text Hello, World! to the screen public class HelloWorld { public static void main(string[ ] args) { System.out.println( Hello, World! ); } } RULE: The name you give your class MUST be the same name you give your file. Thus, the above program must be saved in a file called HelloWorld.java

50 In-Class Assignment Go to our Moodle page and work on the HelloWorld.java assignment: /** * This is an example class that illustrates printing a message to the screen * YOUR NAME */ public class HelloWorld { public static void main(string[] args) { System.out.println("Hello World! My name is [put your name here]."); System.out.println("I [am new to programming, have done some Java/C/etc. programming]."); System.out.println("I am a [freshman, sophomore, junior, senior] in the [department name] department."); System.out.println("At home, I use a [pc, mac, etc] with the [Windows 7/8/10, OSX, Linux, etc] operating system."); } }