How Do I Use The NextDouble Scanner?

How Do I Use The NextDouble Scanner? import java.util.*; public class ScannerNextDoubleExample4 { public static void main(String args[]){ double value; Scanner scan = new Scanner(System.in); System.out.print(“Enter the numeric value : “); value = scan.nextDouble(); System.out.println(“Double value : ” + value +” nTwice value : ” + 2.0*value ); How do I read a scanner string?