Java Math.tan() with degrees

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public class MathExample {

    static double calculateTan(double deg) {
        double radians = (Math.PI / 180) * deg;

        return Math.tan(radians);
    }

    public static void main(String[] args) {
        // Example:
        double x1 = 0.0;  // beginning of calculation in degrees
        double x2 = 90.0; // ending of calculation degrees

        double dx = 30.0;  // calculation step in degrees

        for (double deg = x1; deg  <= x2; deg  += dx) {
            double y = calculateTan(deg );

            System.out.println("tan(" + deg + " deg) = " + y);
        }
    }
}

/*

OUTPUT:
tan(0.0 deg) = 0.0
tan(30.0 deg) = 0.5773502691896257
tan(60.0 deg) = 1.7320508075688767
tan(90.0 deg) = 1.633123935319537E16

*/