Java program * Interfaces 1. Modify the class Rectangle to implement the Comparable interface, as shown in the following UML class diagrams. Apply the required changes in the class’s header. 2. Then, in the Rectangle class override the method compareTo(), so if this object’s area is greater than the specified (given through the parameter) object’s area return 1, if it is less than return -1, and 0 otherwise. 3. Create a test class named Test2. Then complete the following tasks: a. Create an ArrayList and add to it 4 Rectangle objects with different width and height values. b. Print out the elements of the ArrayList. c. Sort the elements of the ArrayList using the static method sort of the class java.long.Collections. This would be possible only, if you implemented the method compareTo() correctly in the Rectangle class. d. After sorting the elements of the ArrayList, print the elements again. 4. Run the Test class.
Java program
* Interfaces
1. Modify the class Rectangle to implement the Comparable interface, as shown in the
following UML class diagrams. Apply the required changes in the class’s header.
2. Then, in the Rectangle class override the method compareTo(), so if this object’s area is
greater than the specified (given through the parameter) object’s area return 1, if it is less
than return -1, and 0 otherwise.
3. Create a test class named Test2. Then complete the following tasks:
a. Create an ArrayList and add to it 4 Rectangle objects with different width and height
values.
b. Print out the elements of the ArrayList.
c. Sort the elements of the ArrayList using the static method sort of the class
java.long.Collections. This would be possible only, if you implemented the method
compareTo() correctly in the Rectangle class.
d. After sorting the elements of the ArrayList, print the elements again.
4. Run the Test class.
Here is the rectangle's class program
public class Rectangle extends GeometricObject {
private double width;
private double height;
public Rectangle() {
this.width = 1.0;
this.height = 1.0;
}
public Rectangle(double width, double height) {
this.width = width;
this.height = height;
}
/** Return width */
public double getWidth() {
return width;
}
/** Set a new width */
public void setWidth(double width) {
this.width = width;
}
/** Return height */
public double getHeight() {
return height;
}
/** Set a new height */
public void setHeight(double height) {
this.height = height;
}
@Override
public String toString() {
return "The rectangle is created " + getDateCreated() + " and the width is " + width + " and the height is " + height ;
}
}
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