Java语言怎么判断一个平行四边形是不是三角梯形

public class Parallelogram {
    // 定义平行四边形的四个顶点
    private Point A;
    private Point B;
    private Point C;
    private Point D;

    public Parallelogram(Point A,Point B,Point C,Point D){
        this.A = A;
        this.B = B;
        this.C = C;
        this.D = D;
    }

    public boolean isTrapezoid(){
        // 检查是否满足三角梯形的条件
        return(isParallel(B, C) && !isParallel(A, D)) || (isParallel(A, D) && !isParallel(B, C));
    }

    private boolean isParallel(Point p1, Point p2) {
        // 检查两个线段是否平行
        return (p1.getY() - p2.getY()) / (p1.getX() - p2.getX()) == 0;
    }
}

public class Point {
    private double x;
    private double y;

    public Point(double x, double y){
        this.x = x;
        this.y = y;
    }

    public double getX() {
        return x;
    }

    public double getY() {
        return y;
    }
}

public class ParallelogramTransformation {
    // 平行四边形到三角梯形的几何变换
    public static Parallelogram transformToTrapezoid(Parallelogram parallelogram, Point vertexA) {
        Point pointC = new Point(vertexA.getX(), parallelogram.getC().getY());
        Point pointD = new Point(parallelogram.getD().getX(), vertexA.getY());

        return new Parallelogram(vertexA, parallelogram.getB(), pointC, pointD);
    }
}