JUnit parameterized test for median function

Question

I am trying to write a JUnit test for a function that finds the median for a given array of double elements.

However, I am struggling with passing the parameters. My code looks like this:

@RunWith(Parameterized.class)
public class MedianParameterizedTest extends TestCase {


    private Double[] numbers;
    private Double expectedMedian;

    public MedianParameterizedTest(Double[] numbers, double expectedMedian){
        this.numbers = numbers;
        this.expectedMedian = expectedMedian;
    }

    @Parameterized.Parameters
    public static Collection medianArrays() {
        return Arrays.asList(new Object[][] {
                { {-5.0,-4.0,3.0},  -4.0}
        });
    }

    @Test
    public void test1() {
        //doing test
    }
}

But this gives me an illegal initializer for java.lang.Object error for the medianArrays collection and I can't find out why.