Question

Java Simple Programming

Task 2: The PongScore Class:

Description:

The PongScore class describes the object that the Pong application uses to keep track of the score for each player. The following class diagram illustrates the information and operations that are defined by the PongScore class.

When the Pong application is executed it creates two PongScore objects, one for the blue player and one for the green player. Each time the ball contacts the end wall behind the blue paddle, the scorePoints(...) method of the green player's PongScore object is invoked, and vice versa. When invoking the scorePoints(...) method, the Pong application passes it an argument corresponding to the number of points indicated in the region of the wall that was contacted. The Pong application will then invoke the getScore() method to determine the score to be displayed beside the player's name below the playing field.

Implementation:

Implement the PongScore class in the file PongScore.java in your /CIS36A/Pong directory. Your implementation must meet the specifications given in the Java Documentation for the PongScore classLinks to an external site..

To compile the java class, use this command: javac PongScore.java.

Testing:

To test the PongScore class write a class named PongScoreTest that contains a main method. Your PongScoreTest program should use a format similar to that used in PongBallTest. Be sure to create several PongScore objects and to call the scorePoints(...) method with several different arguments.

Integration:

Once you have fully tested your PongScore class you can integrate it into the Pong application.

When you run the Pong application and press the "B" key, the ball will again begin to bounce around the playing field. However, now each time the ball contacts the end wall the opponent's score will be incremented by the appropriate number of points.

Answer 1

A PongScore class in Java tracks scores for players in a Pong game with methods to update and retrieve the score. Testing is done via a PongScoreTest class with a main method.

Step-by-step explanation:

The PongScore class in Java is an essential component for keeping track of scores in a Pong game. To implement the PongScore class, you need to define two primary methods: scorePoints(...) and getScore(). The scorePoints method is responsible for updating the score whenever the ball hits the end wall behind a player. It takes an integer parameter representing the number of points to add. The getScore method, on the other hand, is used to retrieve the current score for display.

Example Implementation:

public class PongScore {
private int score;

public PongScore() {
this.score = 0;
}

public void scorePoints(int points) {
this.score += points;
}

public int getScore() {
return this.score;
}
}

To test the PongScore class, you will create a separate class named PongScoreTest that includes a main method. This class will instantiate several PongScore objects and call the scorePoints method with various arguments to ensure that it correctly updates the score.