How to Safely Close a Scanner Without Affecting System.in?

How to Handle Scanner Closure without Disrupting System.in

In programming, maintaining good coding practices is essential. One of these practices is closing resources after use, including Scanner objects linked to System.in. However, closing the Scanner while System.in is still active can lead to unexpected consequences.

If you're facing this dilemma, it's important to understand that closing a Scanner instance doesn't automatically close System.in. The Scanner is simply an I/O stream adapter that reads user input from System.in. Here's the solution:

The simplest and recommended approach is not to close the Scanner if you intend to continue reading from System.in. Closing the Scanner is necessary to free up system resources, but it's not crucial if System.in remains open.

As a best practice, create a single Scanner instance at the beginning of your program and use it throughout. By doing so, you avoid creating multiple instances and closing them repeatedly, which can be inefficient.

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