小白有个问题（java）

Question

照着《java语言程序设计》（Danial.Liang）的程序打的
为什么提示
已在方法 main(String[])中定义了变量 p1

代码如下
import java.util.Scanner;
import javafx.geometry.Point2D;
public class Test
{
public static void main(String[] args)
{

        Scanner input = new Scanner(System.in);

        System.out.println("enter point1's x-,y-coordinates:");
        double x1 = input.nextDouble();
        double y1 = input.nextDouble();
        System.out.println("enter point2's x-,y-coordinates:");
        double x2 = input.nextDouble();
        double y2 = input.nextDouble();

        Point2D p1 = new Point2D(x1, y1);
        Point2D p1 = new Point2D(x2, y2);
        System.out.println("p1 is"+p1.toString());
        System.out.println("p2 is"+p2.toString());
        System.out.println("the distance between p1 and p2 is"+p1.distance(p2));

}

}

Answer 1

Point2D p1 = new Point2D(x1, y1);
Point2D p1 = new Point2D(x2, y2);
p1重复了