Problem

Ellipse program:Java’s API classes make extensive use of inheritance. For example, Oracle’...

Ellipse program:

Java’s API classes make extensive use of inheritance. For example, Oracle’s Java API documentation shows that the

java.awt.geom.Ellipse2D

package has a class named

Double

that has these instance variables:6

double

height

The overall height of the

Ellipse2D.

double

width

The overall width of this

Ellipse2D.

double

The x-coordinate of the upper-left corner of this

Ellipse2D.

double

The y-coordinate of the upper-left corner of this

Ellipse2D.

And it has these constructors:

Double()

Constructs a new

Ellipse2D,

initialized to location (0, 0). and size (0, 0).

Double(

double x, double y, double w, double h

)

Constructs and initializes an

Ellipse2D

from the specified coordinates.

It has accessors for the instance variables, and an initializing method, but that’s about all. Fortunately, this class

extends

a class called

Ellipse2D,

which has several other useful methods, including:

boolean

contains (

double x, double y

)

Tests if a specified point is inside the boundary of this

Ellipse2D.

boolean

contains (double x, double y, double w, double h)

Tests if the interior of this Ellipse2D entirely contains the specified rectangular area.

boolean

intersects (

double x, double y, double w, double h

)

Tests if the interior of this

Ellipse2D

intersects the interior of a specified rectangular area.

Write a short program in a class called

EllipseDriver:

Import

java.awt.geom.Ellipse2D.Double,

and write a

main

method that calls the 4-parameter

Double

constructor to instantiate an ellipse like that shown in the picture below.7 Then, in

println

statements, call the superclass’s 2-parameter

contains

method to show whether the points x=3.5, y=2.5 and x=4.0, y=3.0 are contained within the specified ellipse.

Output:

contains x=3.5,  y=2.5?  falsecontains x=4.0,  y=3.0?  true

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Solutions For Problems in Chapter 13

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