For the GeometricObject and Circle classes in Listings 1 and 2, answer the following quest...

For the GeometricObject and Circle classes in Listings 1 and 2, answer the following questions:

a. Assume are circle and object created as follows:

Circle circle = new Circle(1);
GeometricObject object = new GeometricObject();

Are the following Boolean expressions true or false?

(circle instanceof GeometricObject)
(object instanceof GeometricObject)
(circle instanceof Circle)
(object instanceof Circle)

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b. Can the following statements be compiled?

Circle circle = new Circle(5);
GeometricObject object = circle;

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c. Can the following statements be compiled?

GeometricObject object = new GeometricObject();
Circle circle = (Circle)object;

LISTING 1 SimpleGeometricObject.java

1 public class SimpleGeometricObject {
2 private String color = "white";
3 private boolean filled;
4 private java.util.Date dateCreated;
5
6 /** Construct a default geometric object */
7 public SimpleGeometricObject() {
8 dateCreated = new java.util.Date();
9 }
10
11 /** Construct a geometric object with the specified color
12 * and filled value */
13 public SimpleGeometricObject(String color, boolean filled) {
14 dateCreated = new java.util.Date();
15 this.color = color;
16 this.filled = filled;
17 }
18
19 /** Return color */
20 public String getColor() {
21 return color;
22 }
23
24 /** Set a new color */
25 public void setColor(String color) {
26 this.color = color;
27 }
28
29 /** Return filled. Since filled is boolean,
30 its getter method is named isFilled */
31 public boolean isFilled() {
32 return filled;
33 }
34
35 /** Set a new filled */
36 public void setFilled(boolean filled) {
37 this.filled = filled;
38 }
39
40 /** Get dateCreated */
41 public java.util.Date getDateCreated() {
42 return dateCreated;
43 }
44
45 /** Return a string representation of this object */
46 public String toString() {
47 return "created on " + dateCreated + "\ncolor: " + color +
48 " and filled: " + filled;
49 }
50 }

Listing 2 CircleFromSimpleGeometricObject.java

1 public class CircleFromSimpleGeometricObject
2 extends SimpleGeometricObject {
3 private double radius;
4
5 public CircleFromSimpleGeometricObject() {
6 }
7
8 public CircleFromSimpleGeometricObject(double radius) {
9 this.radius = radius;
10 }
11
12 public CircleFromSimpleGeometricObject(double radius,
13 String color, boolean filled) {
14 this.radius = radius;
15 setColor(color);
16 setFilled(filled);
17 }
18
19 /** Return radius */
20 public double getRadius() {
21 return radius;
22 }
23
24 /** Set a new radius */
25 public void setRadius(double radius) {
26 this.radius = radius;
27 }
28
29 /** Return area */
30 public double getArea() {
31 return radius * radius * Math.PI;
32 }
33
34 /** Return diameter */
35 public double getDiameter() {
36 return 2 * radius;
37 }
38
39 /** Return perimeter */
40 public double getPerimeter() {
41 return 2 * radius * Math.PI;
42 }
43
44 /** Print the circle info */
45 public void printCircle() {
46 System.out.println("The circle is created " + getDateCreated() +
47 " and the radius is " + radius);
48 }
49 }