CPSC150L Lab 0 Lab Set Up

Transcription

1 CPSC150L Lab 0 Lab Set Up Fall 2016 Welcome to the laboratory exercises that accompany the lecture course CPSC 150 Computers and Programming I. These lab exercises are designed to support and complement the material presented in lectures; however, the lab and lecture may cover topics at different times or with a different emphasis. In this first lab, we will get acquainted with the software that will support our main goal: creating computer programs using the Java programming language. It is not the intention of this first lab to emphasize Java programming; instead you are to take the Java programs provided for you and learn how to use the tools in this lab to create an test programs. If you have questions regarding why a particular program behaves as it does, feel free to ask your lab instructor, but understand that the details of the programs will be addressed in lecture and in the following labs. 1 Structure of the Labs Grading: Labs have questions and exercises that you should complete. Pay careful attention to the instructions regarding how the questions are to be graded. For the majority of the lab exercises, you will use a automated grader called WebCAT to check the correctness of the program. For the exercises that are not graded by WebCAT, your instructor will verify the correctness of your code. The number of questions you answer and the exercises you c Christopher Newport University,

2 complete will determine your total grade. Additionally, your instructor may enforce certain code conventions such as requiring all code to be properly indented. Your instructor will give you the specific grading scale for your particular section. Be sure to ask your instructor for details associated with the grading of each lab. The goal of the lab is to provide you with an instructor that will assist you with the questions you encounter. In order to do so, WebCAT is integrated into the grading aspects of the course so that your instructor can focus on answering your questions instead of determining the correctness of your programs. You may consult with other students in the lab to complete your work as the course incorporates a team programming philosophy, and encourages discussion. You must program the solutions yourself; be careful to understand the difference between working together and copying the work of others. Late submissions: Your instructor will determine how and if late lab submissions are allowed, so be sure to check with your instructor. Be aware that these labs are created and ordered to enhance your success in CPSC150, and that completing these labs after their due dates could result in you being unprepared for an assignment in the lecture. Online Content: Your instructor will provide you with the location of online content to support this course, including the lab manuals, the unit tests, reference materials including Java source files where applicable, links to relevant online content, and instructional videos. 2

3 2 Operating System Essentials 2.1 Logging In Be sure to read this entire section before attempting to log in. You should have received, via , or will soon be receiving information to log into your PCSE account. If you have already taken a course in the department, your username and password remains the same. This account is not the same account you use to read your CNU , instead it provides access to the departmental file server. Type your username and password and press the button labeled Log In. If you are unsuccessful in logging in, check for the following. 1. Are you using the correct password? (It s not your cnu.edu password!) 2. Passwords are case-sensitive. For example, M is different from m. 3. CAPS LOCK key should not be pressed in 4. NUM LOCK key should not be pressed in 5. Capital O looks similar to numeral 0. Are you tapping the correct key? 6. Uppercase I looks similar to lower case L and numeral 1 (one). Are you tapping the correct key? If you have not been successful despite after making the above adjustments, see your instructor for assistance in determining your password. If your instructor does not know your password, you may need to contact the system administrator to obtain it or have it reset. Your instructor can help you with this. There are many situations which might delay your obtaining the proper account information if we do not have correct addresses or the most up-to-date registration. In this case, there is an alternative way to log into the system as a generic user. Ask your instructor for details. The drawback of using this alternative is that you will not have access to your files 3

4 on the server and you will not be able to save to the server. You should start using your username and password as soon as you can. 2.2 Ownership of Files The most important concept to grasp from the beginning is how your files will be stored and managed, so let s start with the process of establishing how to log in with your username and password which will be used to manage file ownership. Picture the organization as follows. Figure 1: Computer Organization As you work on the workstation in the lab, you determine whether the file will be stored on the machine in the lab, or on the file server. Here are a few primary reasons that you want to store files on the files server. The images on the lab machines may be reset every time the machine is rebooted. This means that anything you store on this machine will be deleted. 4

5 You want to be able to access your account files from any machine in the lab and from your dorm room. You want the files password protected and backed up to a secondary storage. Storing the files on the file server provides protection, global access and backup of you files. So... store your files on the file server when possible. The name of the file server we will be using is Samba and can be found by clicking on Computer in the Window start menu, denoted as S:. 2.3 Access to Server Storage Once you have logged on with your personal username and password, you will be able to access the file server. On Windows, this will be through a network drive (specifically as drive S:\). On Mac OSX, this will be your home directory. If you had to log in with the generic username, you will NOT have access to this server resource until your login problems are resolved, but you can still store your work on the C: drive or Mac Desktop and complete this lab. However, once you log out or restart the machine, your files will be erased. You should save any files you would like to keep to a thumbdrive or by ing the files to yourself. It is important that you read over this section and then revisit the section after you get your username and password. 3 Files and Directories Whether you are using a remote file server or your local machine to store your programs, one needs a basic understanding of the organization of the file system of your OS. There are videos to help explain files and directories, using Windows directories as the point of focus. If you feel that you need further assistance, watch the instructional videos. 5

6 Files and Directories The C: Drive These are only included as a resource to bring your level of understanding to a minimal level, so use your own discretion to determine what is necessary. Also remember that you have your instructor and student tutors to assist you. In the event that you need help with the notion of directories and drives in Windows, there are a number of videos on the course website to assist with this. View the videos depending on your current expertise. They are not lengthy, so if you have questions about whether to view them or not... watch them! The important points to remember are the following. There are two locations on the lab machines where you should store your files, namely Code: C:\Users\<your username>\my Documents\ and Code: S:\Windows\My Documents\. If you logged in with the generic username, then you will not have access to the S: drive. Otherwise, you logged into your personal account and should see the S: drive under My Computer (Windows 7) or This PC (Windows 10). Everything on this drive is your account, but you should still be careful about how you use this space. Do not delete any of the files that are already in your account. Instead create new directories on this drive for storage and organization of your assignments. Contents on the S: drive can only be accessed by you, however you can access them from any PCSE computer. If it is necessary to use the C: drive location (your account is not yet set up), understand that these files are very frequently deleted and also are readable and writable by anyone 6

7 who logs on with that username. This is especially problematic if you had to log on as the generic user. In the case of the generic user, all files from the session are purged when you log off, so be careful! 4 Setting Up Your Computer This section focuses on installing the Java Development Kit (JDK) and jedit. 4.1 Installing Java on Your Personal Computer If you have the JDK installed, ensure that its version is at least 1.8. If you do not, download the JDK (called the Java SE Development Kit) for your operating system from Note, this is different from the Java Runtime Engine (JRE), which allows you to execute existing Java programs but not develop new ones. Make sure you remember the version number (8u##) that you downloaded as this will be important in a couple of steps. If you own a Mac, your machine likely already has the updates appropriate for your version of the MacOS. You will still need to do the second step and install jedit. Questions regarding Java and MacOS can generally be answered at If you own a PC, a Flash movie is available to guide you though this process. When you access the course web site (available from your instructor) to run the video, you may be asked if you want to install the Flash player, and if so, respond to do that installation also. Watching the video only takes about 5-6 minutes and the actual process of installation of Java takes a little longer. You can watch the video, and step through your own installation at the same time, pausing the movie when relevant. The video for Java installation can be found at the course web site and is named Setting up Java. 7

8 4.2 Configuring Your Computer for Java Development In order to properly configure your personal computer for using command-line Java, it is necessary to modify environment variables. Watch the Environment Variables video for instructions on how to configure environment variables for Java on a Windows PC. If you are on Mac or Linux, you are ready to program. If you have an aversion to videos, then navigate to My Computer (Windows 7) or This PC (Windows 10) and right click inside the window and then click Properties. In the window that pops up, click Advanced System Settings. A window with a button titled Environment Variables should pop up. If there is a field under User variables called PATH, then go ahead and click it and then click edit. In this, you will add the path to the JVM, usually Code: C:\Program Files\java\jdk<version>\bin and then hit OK. You only need to perform the above activities once for your machine. These configurations have already been applied to the lab machine, so upon completion of these tasks your machine should perform identically to the lab machines. 4.3 Installing jedit jedit is a text editor that will be used to create Java programs. jedit requires the installation of Java, so be sure you have gone through the previous steps before installing jedit. All users will need to install jedit as it is not a default installation of any operating system. You can find the download for jedit at If you need help, a video to assist you with this process is available at the course web site and is named Installing jedit. 8

9 4.4 Transferring Files Between Your Computer and the File Server At this point, the easiest mechanism for transfer is to use a simple USB drive or a cloud storage service. You can also yourself you lab files. Additionally, CNU provides a Git server at if you wish to use that. 9