NoSuchElement using a scanner
I have declared two strings and reading the input using Scanner(System.in).
After that, when I close the scanner and read another input again with the scanner, it throws an error: NoSuchElementException . Please help me with this
import java.util.Scanner;
import java.io.*;
public class NumericInput
{
public static void main(String[] args)
{
// Declarations
Scanner in = new Scanner(System.in);
String string1;
String string2;
// Prompts
System.out.println("Enter the value of the First String .");
// Read in values
string1 = in.nextLine();
// When i am commenting below line(in.close) code is working properly.
in.close();
Scanner sc = new Scanner(System.in);
System.out.println("Now enter another value.");
string2 = sc.next();
sc.close();
System.out.println("Here is what you entered: ");
System.out.println(string1 + " and " + string2);
}
}
+3
Vivek
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2 answers
When you close
your scanner it also closes System.in
, you use it again, but it is closed, so when you try to use it again Scanner
, the open stream is System.in
not found.
+4
Maroun
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There is no need to close the scanner, as it implements the AutoCloseable interface, you must declare resources in try-with-resources with java 7. If closing the scanner is a problem.
try(Scanner in = new Scanner(System.in); Scanner sc = new Scanner(System.in)){
// do stuff here without closing
}
catch(Exception){
e.printStackTrace();
}
0
Sharp edge
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