Generate random lat lng

RandomLatLngUtils.java

import co.threelines.puffin.util.GeoSpatialUtil;
import com.spatial4j.core.shape.Point;
import org.apache.commons.lang3.tuple.Pair;

import java.util.Random;

/**
 * Created by Fuxing
 * Date: 5/7/2015
 * Time: 3:22 AM
 * Project: jarvis
 */
public class RandomLatLngUtils {
    
    private static Point randomPoint(double lat, double lng, int radius) {
        Pair<Double, Double> latLng = random(lat, lng, radius);
        return GeoSpatialUtil.makePoint(latLng.getLeft(), latLng.getRight());
    }
    
    /**
     * random point in a circle
     * @param lat lat of circle
     * @param lng lng of circle
     * @param radius radius of circle in meters
     * @return random lat,lng point
     */
    private static Pair<Double, Double> random(double lat, double lng, int radius) {
        Random random = new Random();

        // Convert radius from meters to degrees
        double radiusInDegrees = radius / 111000f;

        double u = random.nextDouble();
        double v = random.nextDouble();
        double w = radiusInDegrees * Math.sqrt(u);
        double t = 2 * Math.PI * v;
        double x = w * Math.cos(t);
        double y = w * Math.sin(t);

        // Adjust the x-coordinate for the shrinking of the east-west distances
        double new_x = x / Math.cos(lat);

        return Pair.of(y + lat, new_x + lng);
    }

}

how to use?