Question

In Java 8

Write a HomeworkGrades class that stores the homework grades for 8 chapters into an array of doubles. • Write a constructor that takes an array as input and copies the contents of the array into the class’ array. • Write methods to calculate: • The average of the homework grades • The lowest grade • Write a main function that creates an array with this data: • double[ ] grades = {98.7, 77.9, 90, 83, 67, 33, 81, 90 }; • Print the average for the homework and the lowest grade, by calling the methods written in the HomeworkGrades class. Average and lowest grade should be printed with 2 digits after the decimal.

Answer 1

Code

save the following code in file named Main.java

class HomeworkGrades
{
private double []grades;

public HomeworkGrades(double grades[])
{
this.grades=new double[grades.length];
for(int i=0;i<grades.length;i++)
this.grades[i]=grades[i];
}
public double getAverage()
{
double sum=0;
for(int i=0;i<grades.length;i++)
sum+=grades[i];
return sum/grades.length;
}
  
public double fildLowestGrade()
{
double min=grades[0];
for(int i=1;i<grades.length;i++)
if(min>grades[i])
min=grades[i];
return min;
}
  
}
public class Main
{
public static void main(String[] args)
{
double[ ] grades = {98.7, 77.9, 90, 83, 67, 33, 81, 90 };
HomeworkGrades homework=new HomeworkGrades(grades);
System.out.printf("Average grade is %.2f%n",homework.getAverage());
System.out.printf("Lowest grade is %.2f%n",homework.fildLowestGrade());
}
  
}

output

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Answer 2

Here is an implementation of the HomeworkGrades class that stores the homework grades for 8 chapters into an array of doubles, and provides methods to calculate the average and lowest grade:

public class HomeworkGrades {    private double[] grades;    public HomeworkGrades(double[] grades) {        this.grades = grades.clone();
    }    public double getAverage() {        double sum = 0;        for (double grade : grades) {
            sum += grade;
        }        return sum / grades.length;
    }    public double getLowestGrade() {        double min = Double.MAX_VALUE;        for (double grade : grades) {            if (grade < min) {
                min = grade;
            }
        }        return min;
    }
}

And here is a main function that creates an array with the given data and prints the average and lowest grade:

public static void main(String[] args) {    double[] grades = {98.7, 77.9, 90, 83, 67, 33, 81, 90};    HomeworkGrades hwGrades = new HomeworkGrades(grades);
    System.out.printf("Average: %.2f\n", hwGrades.getAverage());
    System.out.printf("Lowest grade: %.2f\n", hwGrades.getLowestGrade());
}

When you run the main function, it should output:

Average: 78.87Lowest grade: 33.00

Note that we use the printf method with the format string "%.2f" to print the average and lowest grade with two digits after the decimal.