Vector Class

public class Application {

    public static void main(String[] args) {

        Vector a = new Vector(13, 25, 4);
        Vector b = new Vector(43, -7, 11);

        ViewResult.showScalarResult(a.scalarProduct(b));
        ViewResult.showVectorResult(a.vectorProduct(b));
    }
}

class ViewResult{
    public static void showVectorResult(double[] result) {
        System.out.print("Векторное произведение векторов:[a,b]=<");
        for (int i = 0; i < result.length; i++) {
            System.out.print(result[i] + (i != 2 ? ";" : ">\n"));
        }
    }

    public static void showScalarResult(double d) {
        System.out.println("Скалярное произведение векторов: " + d);
    }
}

class Vector {
    private double[] array = new double[3];

    public Vector(double... x) {
        for (int i = 0; i < array.length; i++) {
            array[i] = x[i];
        }
    }

    public double[] vectorProduct(Vector vector) {
        double[] result = new double[3];
        for (int i = 0; i < 3; i++) {
            result[i] = this.array[(i + 1) % 3] * vector.array[(i + 2) % 3] - this.array[(i + 2) % 3] * vector.array[(i + 1) % 3];
        }
        return result;
    }

    public double scalarProduct(Vector vector) {
        double result = 0;
        for (int i = 0; i < 3; i++) {
            result += this.array[i] * vector.array[i];
        }
        return result;
    }
}