4 Lab Tuesday pm:

Design methods, build a test suite, introduction to templates

Methods for simple classes and classes with containment

Remember the class Image from exercise 2 for creating Web pages. Develop the following methods for this class:

isPortrait, which determines whether the image is taller than wider;
size, which computes how many pixels the image contains;
isLarger, which determines whether one image contains more picture than some other image.

Develop the following methods for the class House from exercise 2:

isBigger, which determines whether one house has more rooms than some other house;
thisCity, which checks whether the advertised house is in some given city (assume we give the method a city name);
sameCity, which determines whether one house is in the same city as some other house.

Don't forget to test these methods.

Here is a revision of the problem of managing a runner's log (see figure 4):

Develop a program that manages a runner's training log. Every day the runner enters one entry concerning the day's run. ...For each entry, the program should compute how fast the runner ran. ...

Develop a method that computes the pace for a daily entry.

+-----------------+
| Entry           |
+-----------------+   +-----------+
| Date d          |-->| Date      |
| double distance |   +-----------+
| int duration    |   | int day   |
| String comment  |   | int month |
+-----------------+   | int year  |
                      +-----------+
Figure: An entry for a runner's log

Methods for composition

Note: The classes for the exercise 4 are in your handouts. Add the methods to these classes.

Recall the problem of writing a program that assists a book store manager (see exercise 2). Develop the following methods for this class:

currentBook that checks whether the book was published in 2003 or 2002;

currentAuthor that determines whether a book was written by a current author (born after 1940);

thisAuthor that determines whether a book was written by the specified author;

sameAuthor that determines whether one book was written by the same author as some other book;

sameGeneration that determines whether two books were written by two authors born less than 10 year apart.

Exercise 2 provides the data definition for a program that keep track of weather records. Develop the following methods:

withinRange that determines whether today's high and low temperatures were within the normal range;

rainyDay that determines whether the precipitation is higher than some given value;

recordDay that determines whether the temperature broke either the high or the low record;

warmerThan that determines whether one day was wormer than another day;

lowerRecord that determines whether the record low for one day was lower than for some other day.

[Go to first, previous, next page]