在java中将纬度和经度转换为北向和东向？

import java.lang.Math;

public class CoordinateConverter {
    public static void main(String[] args) {
        double latitude = 39.9042; // 纬度
        double longitude = 116.4074; // 经度

        double north = convertToNorth(latitude, longitude);
        double east = convertToEast(latitude, longitude);

        System.out.println("北向坐标：" + north);
        System.out.println("东向坐标：" + east);
    }

    public static double convertToNorth(double latitude, double longitude) {
        double R = 6371; // 地球半径，单位：km

        double north = R * Math.cos(Math.toRadians(latitude)) * Math.cos(Math.toRadians(longitude));
        return north;
    }

    public static double convertToEast(double latitude, double longitude) {
        double R = 6371; // 地球半径，单位：km

        double east = R * Math.cos(Math.toRadians(latitude)) * Math.sin(Math.toRadians(longitude));
        return east;
    }
}