Read double from keyboard in Java

Question

How can I read a double variable from keyboard in Java? I\'m trying to solve this, but it didn\'t works. It said:

Exception in thread \"main\" java.util.I

Answer 1

try this:

import java.io.*;
import java.util.Scanner;

class DoubleDouble
{
   public static void main (String[] args)
   {
      double value;
      Scanner scan = new Scanner( System.in );

      System.out.print("Enter a double:");
      value = scan.nextDouble();

      System.out.println("value: " + value +" twice value: " + 2.0*value );
    }
}

And be sure, that you type: For example: 3.14 so the dot, should be a point