How Do You Close Scanner In Java

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How to Close Scanner in Java

The Scanner class in Java is used to read input from a variety of sources, such as the console or a file. It is important to close a Scanner object once you are finished using it, in order to release any resources that it may be holding. If you do not close a Scanner object, it can lead to memory leaks or other errors.

How to Close a Scanner

There are two ways to close a Scanner object:

  • Using the close() method
  • Using the try-with-resources statement

Using the close() method

The close() method is a simple way to close a Scanner object. To use this method, simply call it on the Scanner object. For example:


Scanner scanner = new Scanner(System.in);
scanner.close();

Using the try-with-resources statement

The try-with-resources statement is a convenient way to close a Scanner object, as well as any other resources that implement the AutoCloseable interface. To use this statement, simply declare a Scanner object within the parentheses of the try statement, and the object will be closed automatically when the try block exits. For example:


try (Scanner scanner = new Scanner(System.in)) {
// Use the scanner object here
}
catch (Exception e) {
// Handle any exceptions that may occur
}

When to Close a Scanner

It is important to close a Scanner object as soon as you are finished using it. This will help to prevent memory leaks and other errors. In general, you should close a Scanner object as soon as you have finished reading all of the input that you need from it.

Conclusion

Closing a Scanner object in Java is a simple process that can help to prevent memory leaks and other errors. By following the steps outlined in this article, you can ensure that your Scanner objects are closed properly.

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