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.

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public class TestScores {

    private double[] scores;

    public TestScores(double[] scores) {
       // be sure that the array is not null
       if (scores != null) {
            // check each number in the array
            for (int i = 0; i < scores.length; i++) {
                double score = scores[i];
                if (score < 0 || score > 100) {
                   throw new IllegalArgumentException(
                            "A test score in the array is negative or greater than 100");
       this.scores = scores;

    public double average() {
       // some bad cases
       if (scores == null
                || scores.length == 0) {
            return 0.0;

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