Question

Write a class named TestScores. The class constructor should accept an array
of test scores as its argument. The class should have a method that returns
the average of the test scores. If any test score in the array is negative
or greater than 100, the class should throw an IllegalArgumentException.

Demonstrate the class in a program (create a Driver class in the same file).
The program should ask the user to input the number of test scores to be counted,
and then each individual test score. It should then make an array of those scores,
create a TestScore object, and print the average of the scores.

If an IllegalArgumentException is thrown, the main method should catch it, print "Test scores must have a value less than 100 and greater than 0." and terminate the program.

Answer 1

Coding

import java.util.Scanner;
class TestScore {//second class
float avg=0;
TestScore(int num[]) {//constrctor run
for(int i=0; i<num.length;i++)
   {
   if (num[i] < 0)
{
throw new IllegalArgumentException
("value must be non-negative");
}
   if (num[i] >100)
{
throw new IllegalArgumentException
("value must Less than 100");
}
      
   this.avg=this.avg+num[i];
   }
   this.avg=this.avg/num.length;
}
   void TestScore_method() {//display it method
System.out.println(this.avg);
}

public static void main(String[] args) {
Scanner s=new Scanner(System.in);
System.out.println("enter number of elements");
   int n=s.nextInt();
   int arr[]=new int[n];
   System.out.println("enter elements");
for(int i=0;i<n;i++){//for reading array
arr[i]=s.nextInt();
}
TestScore my = new TestScore(arr);//make object of TestScore
my.TestScore_method();//call method TestScore

}
}

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