Java Scanner close() Method

---

---

Description

The java Scanner close() method closes this scanner.If this scanner has not yet been closed then if its underlying readable also implements the Closeable interface then the readable's close method will be invoked. If this scanner is already closed then invoking this method will have no effect.

Declaration

Following is the declaration for java.util.Scanner.close() method

public void close()

Parameters

NA

Return Value

This method does not return any value.

Exception

NA

Closing a Scanner on a String Example

The following example shows the usage of Java Scanner close() method to close the scanner. We've created a scanner object using a given string. Then we printed the string using nextLine() method and then scanner is closed using close() method.

package com.tutorialspoint;

import java.util.Scanner;

public class ScannerDemo {
   public static void main(String[] args) {

      String s = "Hello World! 3 + 3.0 = 6";

      // 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.nextLine());

      // close the scanner
      System.out.println("Closing Scanner...");
      scanner.close();
      System.out.println("Scanner Closed.");
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Hello World! 3 + 3.0 = 6
Closing Scanner...
Scanner Closed.

Closing a Scanner on User Input Example

The following example shows the usage of Java Scanner close() method to close the scanner. We've created a scanner object using System.in class. Then we printed the string using nextLine() method and then scanner is closed using close() method.

package com.tutorialspoint;

import java.util.Scanner;

public class ScannerDemo {
   public static void main(String[] args) {

      // create a new scanner with the system input
      Scanner scanner = new Scanner(System.in);

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

      // close the scanner
      System.out.println("Closing Scanner...");
      scanner.close();
      System.out.println("Scanner Closed.");
   }
}

Output

Let us compile and run the above program, this will produce the following result − (where we've entered Hello World and pressed enter key.)

Hello World
Hello World
Closing Scanner...
Scanner Closed.

Closing a Scanner on Properties File Example

The following example shows the usage of Java Scanner close() method to close the scanner. We've created a scanner object using a File properties.txt. Then we printed the content using nextLine() method and then scanner is closed using close() method.

package com.tutorialspoint;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class ScannerDemo {
   public static void main(String[] args) throws FileNotFoundException {

      // create a new scanner with a file as input
      Scanner scanner = new Scanner(new File("properties.txt"));

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

      // close the scanner
      System.out.println("Closing Scanner...");
      scanner.close();
      System.out.println("Scanner Closed.");
   }
}

Assuming we have a file properties.txt available in your CLASSPATH, with the following content. This file will be used as an input for our example program −

Height=200
Width=15

Output

Let us compile and run the above program, this will produce the following result −.

Height=200
Closing Scanner...
Scanner Closed.