Question

我需要协助我的Java程序分配。赋值是使用java计算两点之间的距离。我完成了第一部分：

import java.util.Scanner;

public class DistanceCalcEasy
{
   public static void main(String[] args)
   {
   // Creating a new scanner object
   System.out.println("Distance Calculator");
   Scanner input = new Scanner(System.in);

   // Getting all of the coordinates
   System.out.print("Enter the X coordinate of the first point: ");
   double x1 = input.nextDouble();
   System.out.print("Enter the Y coordinate of the first point: ");
   double y1 = input.nextDouble();

   System.out.print("Enter the X coordinate of the second point: ");
   double x2 = input.nextDouble();
   System.out.print("Enter the Y coordinate of the second point: ");
   double y2 = input.nextDouble();

   // Calculating the distance between the points
   double distance = Math.sqrt( Math.pow((x2-x1),2) + Math.pow((y2-y1),2) );

   // Printing the distance to the User
   System.out.println("The distance between the points is " + distance);
   }
}

现在的问题是我需要再次执行相同的程序，但是通过允许用户输入像1,2这样的坐标而不是每个x和y在自己的行上的“硬路”。这是我在经过一些研究后开始提出的：

import java.util.Scanner;

public class DistanceCalcHard
{
   public static void main(String[] args)
   {
      // Creating a new Scanner Object
      System.out.println("Distance Calculator");
      Scanner input = new Scanner(System.in);

      // Getting the data points
      System.out.print("Enter the first point x,y: ");
      String firstPoint = input.nextLine();

      System.out.print("Enter the second point x,y: ");
      String secondPoint = input.nextLine();

      Scanner scan = new Scanner(firstPoint).useDelimiter("\\s*,\\s*");
      while (scan.hasNextDouble() ) 
      { 

      }
      // Calculating the distance

      // Displaying the distance to the user
   }
}

这似乎是一个好的开始吗？我以为我可以制作两个阵列，每个点一个，然后以这种方式进行距离计算。有没有更简单的方法来做到这一点，或者有人能指出我更好的方向？谢谢

Answer 1

将字符串拆分为两个值（即x，y - ＆gt; x和y）的更简单方法是使用split()运算符作为String对象。

String[] pointA = firstPoint.split(",");

第二点也可以这样做。现在，您在阵列中得到两点，其中pointA[0]是x值，pointA[1]是y值。

可以找到有关该方法的更多文档here

Answer 2

这样的事情怎么样：

import java.util.Scanner;

public class DistanceCalcEasy
{
   public static void main(String[] args)
   {
   // Creating a new scanner object
   System.out.println("Distance Calculator");
   Scanner input = new Scanner(System.in);

   // Getting all of the coordinates
   System.out.print("Enter the X,Y coordinate of the first point: ");
   String xy1in = input.nextLine();

   System.out.print("Enter the X,Y coordinate of the second point: ");
   String xy2in = input.nextLine();

   String[] xy1 = xy1in.split(",");
   String[] xy2 = xy2in.split(",");

   double x1 = Double.parseDouble(xy1[0]);
   double y1 = Double.parseDouble(xy1[1]);
   double x2 = Double.parseDouble(xy2[0]);
   double y2 = Double.parseDouble(xy2[1]);

   // Calculating the distance between the points
   double distance = Math.sqrt( Math.pow((x2-x1),2) + Math.pow((y2-y1),2) );

   // Printing the distance to the User
   System.out.println("The distance between the points is " + distance);
   }
}

来自java中同一行的多个输入

2 个答案: