Programming Using Java Unit 4 Assignment

Programming Using Java

Unit 4 Assignment

WEEK 3 ASSIGNMENT PROGRAMMING USING JAVA

Problem

Design a TestScores class that has fields to hold three test scores. The class should have a constructor, getter and setter methods for the test score fields, and a method that returns the average of the test scores. Demonstrate the class by writing a separate class UseTestScores which has main() that creates an instance of the TestScores class. And your program should ask the user to enter three test scores, which will be stored in the TestScores object. Then the program should display the average of the scores, as reported by the TestScores object.

Solution

TestScores.java

public class TestScores {
private int[] scores;

// constructor
public TestScores(int[] scores) {
this.scores = scores;
}

// getter for scores field
public int[] getScores() {
return scores;
}

// setter for scores field
public void setScores(int[] scores) {
this.scores = scores;
}

// method that returns the average of the test scores
public double getAverage() throws IllegalArgumentException {
int sum = 0;
for (int score : scores) {
if (score < 0 || score > 100) { // check if score is within range
throw new IllegalArgumentException("Score must be between 0 and 100");
}
sum += score;
}
return (double) sum / scores.length;
}
}{codeBox}

UseTestScores.java

import java.util.*;

public class UseTestScores {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);

// ask user to enter three test scores
System.out.print("Enter three test scores separated by spaces: ");
int[] scores = new int[3];
for (int i = 0; i < 3; i++) {
scores[i] = input.nextInt();
}

// create TestScores object
TestScores testScores = new TestScores(scores);

// display the average of the scores
try {
System.out.printf("The average score is %.2f", testScores.getAverage());
} catch (IllegalArgumentException e) {
System.out.println(e.getMessage());
}
}
}{codeBox}

This program asks the user to enter three test scores, creates a TestScores object with those scores, and then displays the average of the scores using the getAverage() method of the TestScores class. In case a score is less than 0 or greater than 100, an IllegalArgumentException will be thrown.

Output

D:\Java>java UseTestScores
Enter three test scores separated by spaces: 15 20 25
The average score is 20.00{codeBox}

Programming Using Java Unit 4 Assignment