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POIs this the correct way to use an IllegalArgumentException?
 

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  1. POIs this the correct way to use an IllegalArgumentException?
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    <p>I'm trying to work on a Java assignment. This is what it asks:</p> <blockquote> <p>Write a class named <code>TestScores</code>. The class constructor should accept an array of the test scores as its argument. The class should have a method that returns the average of the test scores. If an test score in the array is negative or greater than 100, the class should throw an <code>IllegalArgumentException</code>. Demonstrate. I need a file named <code>TestScores</code> and <code>TestScoresDemo</code>.</p> </blockquote> <p>This is what I have so far. I know some of it is wrong and I need help fixing it:</p> <pre><code>class TestScores { public static void checkscore(int s) { if (s&lt;0) throw new IllegalArgumentException("Error: score is negative."); else if (s&gt;100) throw new IllegalArgumentException("Error Score is higher then 100"); else if (s&gt;89)throw new IllegalArgumentException("Your grade is an A"); else if (s&gt;79 &amp;&amp; s&lt;90)throw new IllegalArgumentException("Your grade is an B"); else if (s&gt;69 &amp;&amp; s&lt;80)throw new IllegalArgumentException("Your grade is an C"); else if (s&gt;59 &amp;&amp; s&lt;70)throw new IllegalArgumentException("Your grade is an D"); else if (s&lt;60)throw new IllegalArgumentException("Your grade is an F"); { int sum = 0; //all elements together for (int i = 0; i &lt; a.length; i++) sum += a[i]; } return sum / a.length; } } class TestScoresDemo { public static void main(String[] args) { int score = 0; Scanner scanner = new Scanner(System.in); System.out.print(" Enter a Grade number: "); String input = scanner.nextLine(); score = Integer.parseInt(input); TestScores.checkscore(score); System.out.print("Test score average is" + sum); } } </code></pre> <p>I know the assignment calls for a <code>try</code> statement because in my book that's what I see with the <code>IllegalArgumentException</code>. Can anyone help me? I'm using Eclipse as an IDE.</p>
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    1. USAlexandria
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      1. POIs this the correct way to use an IllegalArgumentException?
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    2. VO
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    1. COWhy do you think this is wrong? Do you get an error message you shouldn't? We can't help if we don't know what part needs fixing.
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      1. USLouis Wasserman
    2. COThank you. Let me double check and get back to you. Maybe its just a simple type error
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      1. USAlexandria
    3. COyou should only be throwing an `IllegalArgumentException` in the cases where the argument is not valid in your case below 0 or above 100.
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      1. UStwain249
 

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