Scanner close() method in Java with Examples

Last Updated : 10 Oct, 2018

The close() method ofjava.util.Scanner class closes the scanner which has been opened. If the scanner is already closed then on calling this method, it will have no effect. Syntax:

public void close()

Return Value: The function does not return any value. Below programs illustrate the above function: Program 1:

Java

// Java program to illustrate the
// close() method of Scanner class in Java

import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {

        try {

            // Get the string
            String s = "Geeksforgeeks has Scanner Class Methods";

            // create a new scanner
            // with the specified String Object
            Scanner scanner = new Scanner(s);

            // print the next line of the string
            System.out.println("Scanner: "
                               + scanner.nextLine());

            // close the scanner
            scanner.close();

            System.out.println("\nScanner Closed.\n");

            System.out.println("Trying to use scanner"
                               + " after closing.");

            // print the next line of the string
            System.out.println(scanner.nextLine());
        }

        catch (Exception e) {
            System.out.println("Exception thrown:\n" + e);
        }
    }
}

Output:

Scanner: Geeksforgeeks has Scanner Class Methods

Scanner Closed.

Trying to use scanner after closing.
Exception thrown:
java.lang.IllegalStateException: Scanner closed

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#close()