Java Reference
In-Depth Information
T
ABLE
10.1
2001 United States Federal Personal Tax Rates
Tax
rate
Married filing jointly
or qualifying widow(er)
Married filing
separately
Single filers
Head of household
Up to $27,050
Up to $45,200
Up to $22,600
Up to $36,250
15%
27.5%
$27,051-$65,550
$45,201-$109,250
$22,601-$54,625
$36,251-$93,650
30.5%
$65,551-$136,750
$109,251-$166,500
$54,626-$83,250
$93,651-$151,650
35.5%
$136,751-$297,350
$166,501-$297,350
$83,251-$148,675
$151,651-$297,350
39.1%
$297,351 or more
$297,351 or more
$ 148,676 or more
$297,351 or more
*10.10
(
Game: The
GuessDate
class
) Modify the
GuessDate
class in Listing 10.10.
Instead of representing dates in a three-dimensional array, use five two-dimensional
arrays to represent the five sets of numbers. Thus, you need to declare:
private static int
[][] set1 = {{
1
,
3
,
5
,
7
}, ... };
private static int
[][] set2 = {{
2
,
3
,
6
,
7
}, ... };
private static int
[][] set3 = {{
4
,
5
,
6
,
7
}, ... };
private static int
[][] set4 = {{
8
,
9
,
10
,
11
}, ... };
private static int
[][] set5 = {{
16
,
17
,
18
,
19
}, ... };
*10.11
(
Geometry: The
Circle2D
class
) Define the
Circle2D
class that contains:
■
Two
double
data fields named
x
and
y
that specify the center of the circle with
get
methods.
■
A data field
radius
with a
get
method.
■
A no-arg constructor that creates a default circle with (
0
,
0
) for (
x
,
y
) and
1
for
radius
.
■
A constructor that creates a circle with the specified
x
,
y
, and
radius
.
■
A method
getArea()
that returns the area of the circle.
■
A method
getPerimeter()
that returns the perimeter of the circle.
■
A method
contains(double x, double y)
that returns
true
if the speci-
fied point (
x
,
y
) is inside this circle (see Figure 10.15a).
■
A method
contains(Circle2D circle)
that returns
true
if the specified
circle is inside this circle (see Figure 10.15b).
■
A method
overlaps(Circle2D circle)
that returns
true
if the specified
circle overlaps with this circle (see Figure 10.15c).
p
(a)
(b)
(c)
F
IGURE
10.15
(a) A point is inside the circle. (b) A circle is inside another circle. (c) A circle
overlaps another circle.
Draw the UML diagram for the class and then implement the class. Write a test
program that creates a
Circle2D
object
c1
(
new Circle2D(2, 2, 5.5)
), dis-
plays its area and perimeter, and displays the result of
c1.contains(3, 3)
,
c1.contains(new Circle2D(4, 5, 10.5))
, and
c1.overlaps(new
Circle2D(3, 5, 2.3))
.
