0

I just wrote down a program for a Java Programming question. As mentioned in the problem statement: The purpose of the question is to find out what digits do a particular 5-digit number comprise of and have them printed e.g. if the Number is 4567 then the output of the program should be 4 3 5 6 7

I implemented the solution in two methods one of them is named SimpleWay & the other is named HardWay().

Now when I run the program, after one method e.g. SimpleWay() has been called when the call is made for the HardWay() method I am getting the following error: java.util.NoSuchElementException: No line found

The code is given below:

package com.guru.chapter02;
import java.util.Scanner;
/**
Question:   Write a program that inputs a five-digit integer,separates the integer
            into its digits and prints them separated by three spaces each. 
            [Hint: Use the integer division and modulus operators.] For example, if 
            the user types in 42339, the program should print:
            4   2   3   3   9
**/
public class C02Exercise27{

public static void main(String[] args) throws InterruptedException{
      displayTheDigitsOfNumber_HardWay();
      Thread.sleep(1000);
    displayTheDigitsOfNumber_SimpleWay();

}
private static void p(String str){
    System.out.print(str);
}

private static void displayTheDigitsOfNumber_SimpleWay(){
    Scanner iScn = new Scanner(System.in);
    p("Enter a five-digit number: ");
    String str = iScn.nextLine();       
    try{
        if((str.length()==5) & (((Integer)Integer.parseInt(str)) instanceof Integer)){
                p("The digits of the number are: \n");
                p(str.charAt(0) + " " + str.charAt(1)+ " "+ str.charAt(2)+ " "+ str.charAt(3)+ " "+ str.charAt(4) + "\n");
        }
        else
            p("Re-launch the program & enter strictly a 5-digit number.Alphanumerics or Alphabetical input not allowed"+ "\n");
    }catch(NumberFormatException e){
        p("Re-launch the program & enter strictly a 5-digit number.Alphanumerics or Alphabetical input not allowed" + "\n");
    }
}

private static void displayTheDigitsOfNumber_HardWay(){
    Scanner iScn = new Scanner(System.in);
    p("Enter a five-digit number: ");
    int input = iScn.nextInt();
    iScn.close();
    p("Output Of displayTheDigitsOfNumber_HardWay() method \n");
    p((input/10000)+" ");
    p(((input%10000)/1000)+" ");
    p((((input%10000)%1000)/100)+" ");
    p(((((input%10000)%1000)%100)/10)+" ");
    p(((((input%10000)%1000)%100)%10)+" ");
    p("\n");
}

}

After I have made the call to displayTheDigitsOfNumber_HardWay() I get following error:

Enter a five-digit number: 43567
Output Of displayTheDigitsOfNumber_HardWay() method
4 3 5 6 7
Enter a five-digit number: Exception in thread "main"
java.util.NoSuchElementException: No line found
at java.util.Scanner.nextLine(Unknown Source)
at com.guru.chapter02.C02Exercise27.displayTheDigitsOfNumber_SimpleWay(C02Exercise27.java:25)
at com.guru.chapter02.C02Exercise27.main(C02Exercise27.java:15)
GuruPrasad Das
  • 19
  • 2
  • 5
  • 1
    Probably because of `iScn.close();` - there is no need to close `System.in`. – assylias Nov 11 '15 at 15:34
  • You are not doing it correctly (or atleast how the exercise expects you to). Use `scanner#nextInt()` to read an Integer from the input stream. Then use a while loop. Use modulus operator to get the last digit and divide the number by 10 until the value after division is 0 – TheLostMind Nov 11 '15 at 15:35
  • I confirm what @assylias says. Closing the scanner closes the input stream. You then create a new scanner on the same, closed, input stream. The javadoc says that you'll get an `IllegalStateException` if this scanner is closed, but the scanner itself is not closed: only the underlying stream. So you get a `NoSuchElementException`. – Olivier Grégoire Nov 11 '15 at 18:07

0 Answers0