CSCI 121 Lab Assignment 1

Fall Semester, 2006

 

Outcomes:

 

Upon completion of the lab, the student will know how to

 

·       Log onto the Engineering Computer Lab

 

·       Navigate around the network

 

·       Save files to the J: drive

 

·       Use the DrJava IDE to

 

·       Interactively evaluate Java expressions

 

·       Edit, compile, and execute simple Java applications

 

 

Activities:

 

 

1

 

Login to the lab network using the username and password assigned to you by the Computer Lab staff.

·       Your username is in the form FMLLLL, where F is your first initial, M is your middle initial, and LLLL are the first 4 letters of your last name

·       Your password is the last 6 digits of your student number.  You should change your password when you login for the first time.

 

 

2

 

Following the instructions given by the lab instructor, locate your J: drive and examine its contents.  

·       The J: drive is storage that has been allocated to your computer lab account. 

·       You will save all your work on this drive (not C:).

 

 

3

 

Locate and double-click the DrJava icon on the desktop.  It looks like this:
                            

 

 

4

 

In the Interactions pane at the bottom of the screen, enter the following expressions and record the result of each on the lab sheet provided:

 

A

3 + 5 % 4

 

B

3 / 6

 

C

(double)3 / 6

 

D

(3 + 5) % 4

 

E

5.1 / 2

 

F

Math.sqrt(5)

 

G

“A Java String”.indexOf(“ava”)

 

H

String name = “bob”;

name.toUpperCase()

 

I

name

 

J

String str;

str

 

K

str.toUpperCase()

 

L

str = “ Roberts”

 

M

str.toLowerCase()

 

N

name + str

 

O

name.toUpperCase() + str

 

P

(name + str).toUpperCase()

 

 

 

 

5

 

Enter the following text in the Definitions pane of DrJava (this code contains an error, but type it as written anyway):

 

public class LabAssignment1
{
    public static void main(String[] args)
    {
        System.out.prinln(“Welcome to Computer Science I”);
    }
}

 

 

6

 

Click the Save button on the DrJava toolbar. 

·       In the drop down box labeled Save In:, navigate to the J: drive. 

·       Make sure “Java source files” is selected in the Files of Type textbox, then click “Save”. 

·       This will save your file under the name LabAssignment1.java on your J drive.

 

 

7

 

Select the Tools menu item, then select Compile Current Document.  Write the error message that is displayed on the lab sheet provided.

 

 

8

 

Fix the error in the code for LabAssignment1.  Then repeat steps 6 (Save) and 7 (Compile Current Document).  This time you should see the message “Last Compilation Completed Successfully”

 

 

9

 

Select the Tools menu item, then select “Run Document’s Main Method”.  Show the result to the lab instructor and have the instructor sign the lab sheet in the space provided.

 

 

10

 

Log off the network and turn in the lab sheet to your instructor.