Question: public abstract class GeometricObject { private String color = white; private boolean filled; private java.util.Date dateCreated; /** Construct a default geometric object */ protected GeometricObject()
public abstract class GeometricObject {
private String color = "white";
private boolean filled;
private java.util.Date dateCreated;
/** Construct a default geometric object */
protected GeometricObject() {
dateCreated = new java.util.Date();
}
/** Construct a geometric object with color and filled value */
protected GeometricObject(String color, boolean filled) {
dateCreated = new java.util.Date();
this.color = color;
this.filled = filled;
}
/** Return color */
public String getColor() {
return color;
}
/** Set a new color */
public void setColor(String color) {
this.color = color;
}
/** Return filled. Since filled is boolean,
* the get method is named isFilled */
public boolean isFilled() {
return filled;
}
/** Set a new filled */
public void setFilled(boolean filled) {
this.filled = filled;
}
/** Get dateCreated */
public java.util.Date getDateCreated() {
return dateCreated;
}
/** Return a string representation of this object */
public String toString() {
return "created on " + dateCreated + " color: " + color +
" and filled: " + filled;
}
/** Abstract method getArea */
public abstract double getArea();
/** Abstract method getPerimeter */
public abstract double getPerimeter();
}
public class TestGeometricObject {
/** Main method */
public static void main(String[] args) {
// Declare and initialize two geometric objects
GeometricObject geoObject1 = new Circle(5);
GeometricObject geoObject2 = new Rectangle(5, 3);
System.out.println("The two objects have the same area? " +
equalArea(geoObject1, geoObject2));
// Display circle
displayGeometricObject(geoObject1);
// Display rectangle
displayGeometricObject(geoObject2);
}
/** A method for comparing the areas of two geometric objects */
public static boolean equalArea(GeometricObject object1,
GeometricObject object2) {
return object1.getArea() == object2.getArea();
}
/** A method for displaying a geometric object */
public static void displayGeometricObject(GeometricObject object) {
System.out.println();
System.out.println("The area is " + object.getArea());
System.out.println("The perimeter is " + object.getPerimeter());
}
}
Questions
1. Derive a MyCircle class and a MyRectangle class from GeometricObject and define all abstract methods in the derived classes
2. Use TestGeometricObject class to compare the area of any two GeometricObjects ( either both of type MyCircle, both MyRectangle or one of each type)
3. Now derive a MyTriangle class and repeat step 3 with MyTriangle Object and a MyCircle or MyRectangle
4. Overload the equalArea() method to accept three GeometricObjects as parameters and compare their areas
5. Make changes to the given code if necessary
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