cs110 Using DrJava

CS110 Exercise 3 (5 points) NAME:___________________

Goal for today: Download more book examples, and use DrJava for editing.
Fill in check marks in short ___'s or requested information in longer ones.Turn in one copy and retain another for your own use.

1. Browse to our class web page at www.cs.umb.edu/~eoneil/CS110 ___

2. Download the Chapter 1-12 book examples linked to the class web page under "Textbook". Use Windows Explorer or Finder to drag and drop the examples directory to be under your cs110 directory. ___

3. Check that you can find the chap05 directory using Command Prompt or Terminal.
PC: cd c:\cs110    to get to your cs110 directory from anywhere
       dir              to see things there
       cd examples
       cd chap05 change to the chap05 directory
       dir               should see Age.java, etc
       type Age.java to display it ___
Mac: cd ~/cs110   to get to your cs110 directory from anywhere
       ls                 to see things there
       cd examples
     cd chap05 change to the chap05 directory
       ls                should see Age.java, etc
       more Age.java    to display it.___

4. Compile and run the book examples Age.java. Commands: "javac Age.java" then "java Age", etc.
Show what happened for Age: what you typed, what the computer typed, line by line:

After "java Age"
_____________________________   (prompt and user input)

_____________________________   (computer output)

_____________________________   (computer output)

5. Run DrJava and use the Open Folder command. Navigate to the directory chap05 (first find cs110, then examples, then chap05) that contains the book examples for Chap. 5 and click Select. You should see Age.java, ..., WinPercentage.java listed on the left hand side.
a. Select Age.java and see it displayed in the editor window.
b. Click Compile
c. Click Run (on the far right of the top menu bar). If Run is cut off because of a small screen, you can run use Tools>Run Document
d. Change the program so it says "That's nice" or something else for ages under 21. Save it. Compile and run it. ___

6. Look for the changed program using Command Prompt or Terminal. Just follow the instructions again for step 3, then use
PC: dir Age.*   (Mac: ls Age.*)   (using wildcard *, asking for all files with names starting with "Age.")

Files seen: _________________   ______________________

The .java file is the source file. The .class file is the result of compilation, and is what is used with the java command to execute the program.

7. Using a command, display Age.java to see the edit you made under DrJava

Command you used to display Age.java:_______________________

8. Execute the changed Age.java using a command.

Command you used to execute Age: __________________________