我无法从java中的n多边形获取面积。

public class PolygonAreaCalculator {

    public static double calculateArea(double[][] points) {
        int n = points.length;
        double area = 0.0;

        for (int i = 0; i < n; i++) {
            int j = (i + 1) % n;
            area += points[i][0] * points[j][1];
            area -= points[j][0] * points[i][1];
        }

        return Math.abs(area) / 2.0;
    }

    public static void main(String[] args) {
        double[][] polygonPoints = {
            {0, 0},
            {4, 0},
            {4, 3},
            {0, 3}
        };

        double area = calculateArea(polygonPoints);
        System.out.println("The area of the polygon is: " + area);
    }
}