Lab 6 – Fall 2008 Possible Points: 100 Points Earned: _____

Name _________________________

3.4 What output was generated?

Ï «Ï ----jGRASP exec: java Example1
ϧÏ
Ïϧ Session starting months in 2006:
ÏϧÏJanuary
ÏϧÏAugust
ÏϧÏ
ÏÏ©Ï ----jGRASP: operation complete.

3.8 What output was generated?

Ï «Ï ----jGRASP exec: java Example1
ϧÏ
Ïϧ Session starting months in 2006:
ÏϧÏJanuary
ÏϧÏAugust
ÏϧÏ
ÏÏ©Ï ----jGRASP: operation complete.

3.9 You might be surprised that Example1 executed given that it uses Constants.FALL which is no longer defined. Why did it execute?

because the executable was based on original Constants.java - you didn't recompile

3.11 What error was generated?

Ï «Ï ----jGRASP exec: javac E:\2008-CS239\Lab6\Example1.java
ÏϧÏ
ϼ§ÏExample1.java:10: cannot find symbol
ÏϧÏsymbol : variable FALL
ÏϧÏlocation: class Constants
ÏÏ§Ï for (int i=Constants.SPRING; i<=Constants.FALL; i++)
ÏÏ§Ï ^
ÏϧÏ1 error
ÏϧÏ
ÏÏ§Ï ----jGRASP wedge2: exit code for process is 1.
ÏÏ©Ï ----jGRASP: operation complete.

3.16 What output was generated?

«Ï ----jGRASP exec: java Example1
ÏϧÏ
ÏϧÏSession starting months in 2006:
ÏϧÏJanuary
ÏϧÏAugust
ÏϧÏ
ÏÏ©Ï ----jGRASP: operation complete.

3.17 What is wrong with this output and what caused the problem?

it doesn't show the starting month for Summer.

The problem was caused because in example 1 the output goes from SPRING to FALL and SUMMER comes after FALL in Constants.java

3.21 What output was generated?

«Ï ----jGRASP exec: java Example1
ÏϧÏ
ÏϧÏSession starting months in 2006:
ÏϧÏJanuary
ÏϧÏAugust
ÏϧÏAugust
ÏϧÏ
ÏÏ©Ï ----jGRASP: operation complete.

3.22 What is wrong with this output and what caused the problem?

It shows SUMMER and FALL starting in August.

SemesterUtilities says if the month isn't SPRING it's August.

3.24 Will this version of Example1.java compile?

yes - because the argument to startingMonth is a valid integer

3.25 What output would be generated by this statement?

Ï«Ï ----jGRASP exec: java Example1
ÏϧÏ
ÏϧÏSession starting months in 2006:
ÏϧÏJanuary
ÏϧÏAugust
ÏϧÏAugust
ÏϧÏAugust
ÏϧÏ
ÏÏ©Ï ----jGRASP: operation complete.Ï

3.26 Why is this somewhat troubling?

because August isn't the 7^th month

3.27 What output would be generated by the statement

System.out.println(Constants.SPRING);

Ï0

3.28 What output would be more informative for the previous statement?

The ordinal value for SPRING is 0

4.3 What output was generated?

Ï«Ï ----jGRASP exec: java Example2
ÏϧÏ
ÏϧÏGrade on first attempt: B-
ÏϧÏGrade on second attempt: B+
ÏϧÏ
ÏÏ©Ï ----jGRASP: operation complete.

4.5 What code did you add to the main() method in Example2.java?

(Copy and paste it here.)

if (second.compareTo(first) > 0)
better = second;
else
better = first;

4.8 What output was generated?

Ï «Ï ----jGRASP exec: java Example2
ÏϧÏ
ÏϧÏGrade on first attempt: B-
ÏϧÏGrade on second attempt: B+
ÏϧÏBetter grade: B-
ÏϧÏ
ÏÏ©Ï ----jGRASP: operation complete.

4.9 What is wrong with this output and why?

It says that B- is a better grade than B- and in the real world this isn't true

4.10 How does a "B" compare to a "B-" at JMU and in Java?

B- is better than B in Java, B is better than B- at JMU

5.3 What output was generated?

Ï«Ï ----jGRASP exec: java Example3
ÏϧÏ
ÏϧÏSecond is better
ÏϧÏ
ÏÏ©Ï ----jGRASP: operation complete.

5.4 What determines the order used by the compareTo() method?

The ASCII (or Unicode) collating sequence OR

The order in which the enum values were listed (collating sequence)

5.5 What .class files were generated?

Example3$LetterGrade.class

Example3.class

5.9 What .class files were generated?

LetterGrade.class

Example3.class

5.11 What output was generated?

Ï«Ï ----jGRASP exec: java Example3
ÏϧÏ
ÏϧÏSecond is better
ÏϧÏ
ÏÏ©Ï ----jGRASP: operation complete.

5.12 JMU has instituted a grade of "D-". What changes do you need to make to LetterGrade.java?

insert DMINUS between F, and D