Java Reference
In-Depth Information
Programming Projects
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1. In the sport of diving, seven judges award a score between 0 and 10, where each
score may be a floating-point value. The highest and lowest scores are thrown
out and the remaining scores are added together. The sum is then multiplied by
the degree of difficulty for that dive. The degree of difficulty ranges from 1.2 to
3.8 points. The total is then multiplied by 0.6 to determine the diver's score.
Write a computer program that inputs a degree of difficulty and seven judges'
scores and outputs the overall score for that dive. The program should use an
ArrayList
of type
Double
to store the scores.
2. Write a program that uses an
ArrayList
of parameter type
Contact
to store a
database of contacts. The
Contact
class should store the contact's first and last
name, phone number, and email address. Add appropriate accessor and mutator
methods. Your database program should present a menu that allows the user to
add a contact, display all contacts, search for a specific contact and display it, or
search for a specific contact and give the user the option to delete it. The searches
should find any contact where any instance variable contains a target search string.
For example, if “elmore” is the search target, then any contact where the first name,
last name, phone number, or email address contains “elmore” should be returned
for display or deletion. Use the “for-each” loop to iterate through the
ArrayList
.
3. Many Global Positioning Satellite (GPS) units can record waypoints. The waypoint
marks the coordinates of a location on a map along with a timestamp. Consider a
GPS unit that stores waypoints in terms of an
(X,Y)
coordinate on a map together
with a timestamp
t
that records the number of seconds that have elapsed since the
unit was turned on. Write a program that allows the user to enter as many way-
points as desired, storing each waypoint in an
ArrayList
, where each waypoint is
represented by a class that you design. Each waypoint represents a successive sample
point during a hike along some route. The coordinates should be input as
double
s,
and the timestamp as an integer. Have your program compute the total distance
traveled and the average speed in miles per hour. Use the map scaling factor of
1
=
0.1 miles. For example, if the only two waypoints are (X
=
1,Y
=
1,T
=
0) and
(X
=
2,Y
=
1,T
=
3600), then the hiker traveled a distance of 0.1 miles in 3,600 sec-
onds, or 0.1 miles per hour.
4. Write a generic class,
MyMathClass
, with a type parameter
T
where
T
is a numeric
object type (e.g.,
Integer
,
Double
, or any class that extends
java.lang.Number
).
Add a method named
standardDeviation
that takes an
ArrayList
of type
T
and
returns as a
double
the standard deviation of the values in the
ArrayList
. Use the
doubleValue
() method in the
Number
class to retrieve the value of each number
as a double. Refer to Programming Project 6.5 for a definition of computing the
standard deviation. Test your method with suitable data. Your program should
generate a compile-time error if your standard deviation method is invoked on an
ArrayList
that is defined for nonnumeric elements (e.g.,
Strings
).
