Scanner close() method in Java with Examples

0 0 1 minute read

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 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()