我所做的一切都是过于复杂或错误

Question

// *************************************************************
//   Distance.java
//   Computes the distance between two points in java
// *************************************************************
import java.util.Scanner;
import java.lang.Math;

public class Distance
{
    public static void main (String[] args)
    {
        double x1, y1, x2, y2; // coordinates of two points
        double distance;      // distance between the points

        //Formula -   D=√(x2-x1)^2 + (y2-y1)^2

        Scanner scan = new Scanner(System.in);

        // Read in the two points
        System.out.print ("Enter the coordinates of the first point " +
                "(put a space between them): ");

        x1 = scan.nextDouble();
        y1 = scan.nextDouble();

        System.out.print ("Enter the coordinates of the second point: ");
        x2 = scan.nextDouble();
        y2 = scan.nextDouble();

        // Compute the distance
        double math = x1-x2 * y1-y2;

        // Print out the answer
        System.out.print("The distance between (" + x1 + "," + x2 + ") and (" + y1 + "," + y2 + ") is") ;
    }
}

我一直遇到错误，我会继续使用可以更快更短的代码。我需要做的就是读取坐标的用户输入，找到它们之间的距离，然后打印答案。

Answer 1

首先创建您的Point Class。记住这是Java和OOP

class Project < ActiveRecord::Base
  has_many: users_projects
  has_many: users, through: :user_projects
end

其次，使用距离计算方法

创建Distance类

   class Point {

        private double x;
        private double y;
        private String name;

        public Point(String n, double xx, double yy) {
             this.name = n;
             this.x = xx;
             this.y = yy;
        }

        public double getX() {
             return this.x;
        }

        public double getY() {
             return this.y;
        }

        public String getName() {
             return this.name;
        }

   }

最后修改主要方法如下

   public double getEuclideanDistance(Point p, Point q) {
        double ed = Math.sqrt((q.getX() - p.getX()) * (q.getX() - p.getX()) + (q.getY() - p.getY()) * (q.getY() - p.getY()));
        return ed;
   }

Answer 2

问题是你没有以正确的方式实施距离公式......你有double math = x1-x2 * y1-y2但根本没有打电话给Math.pow()或Math.sqrt()。

尝试实施以下内容：