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我对Java还是个新手，不知道哪里出了问题。

import java.awt.geom.Point2D;

public class Quadrilaterals {

    private Point2D[] vertices;

    public Quadrilaterals(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4) {
        vertices = new Point2D[4];
        vertices[0] = new Point2D.Double(x1, y1);
        vertices[1] = new Point2D.Double(x2, y2);
        vertices[2] = new Point2D.Double(x3, y3);
        vertices[3] = new Point2D.Double(x4, y4);
    }

    public double getPerimeter() {
        double perimeter = 0;
        for (int i = 0; i < 4; i++) {
            perimeter += vertices[i].distance(vertices[(i + 1) % 4]);
        }
        return perimeter;
    }

我不知道如何让它返回0以外的值。