Question

Modify the Puck class to implement the Comparable interface. Two pucks are the equal when they have the same weight. Modify the existing client code to test the new method.

Answer 1

To modify the Puck class to implement the Comparable interface, you need to add the implementation of the Comparable interface to the Puck class. The compareTo method should compare the weights of two pucks and return an integer value indicating their relationship. After modifying the Puck class, you can test the new method by using the compareTo method to compare two pucks and see if they have the same weight.

Step-by-step explanation:

Modifying the Puck class to implement the Comparable interface involves adding the implementation of the Comparable interface to the Puck class. The Comparable interface requires the implementation of the compareTo method, which compares the weight of two pucks and returns an integer value indicating their relationship. In this case, the compareTo method should compare the weights of the pucks and return 0 if they are equal, a negative value if the current puck is lighter, and a positive value if the current puck is heavier. Here's an example of the modified Puck class:

class Puck implements Comparable<Puck> {
private double weight;
public Puck(double weight) {
this.weight = weight;
}
public int compareTo(Puck other) {
if (this.weight == other.weight) {
return 0;
} else if (this.weight < other.weight) {
return -1;
} else {
return 1;
}
}
}

After modifying the Puck class, you can test the new method by using the compareTo method to compare two pucks and see if they are equal in weight. For example:

Puck puck1 = new Puck(15);
Puck puck2 = new Puck(12);
int comparisonResult = puck1.compareTo(puck2);
if (comparisonResult == 0) {
System.out.println("The pucks have the same weight.");
} else {
System.out.println("The pucks have different weights.");
}