Multiple inputs from the same line in java

Question

I am in need of assistance with my Java program assignment. The assignment is to calculate the distance between two points using java. I completed part one as followed:

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);
   }
}

Now the problem is I need to do this same program again but the "hard way" by allowing the user to input a coordinate like 1,2 instead of each x and y on their own line. This is what I have started to come up with after a little bit of research:

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
   }
}

Does that seem like a good start? I was thinking I could make two array's, one for each point, and then do my distance calculation that way. Is there a simpler way to do this or can someone point me in a better direction? Thank You

int[] point1 = firstPoint.split(",") give you the point in array, [1, 2] for example — Baby
– Baby, Commented Jan 15, 2014 at 3:12

endorphins · Accepted Answer · 2014-01-15 03:15:17Z

1

An easier way to go about splitting the string into two values (ie. x,y -> x and y) would be by using the split() operator for a String object.

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

And the same can be done for the second point. Now you have your two points in arrays where pointA[0] is the x value and pointA[1] is the y value.

More documentation about the method can be found here

answered Jan 15, 2014 at 3:15

endorphins

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Comments

user2879327 · Accepted Answer · 2014-01-15 03:15:09Z

How about something like this:

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);
   }
}

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