How To Close a Scanner in Java: The Simplest, Easiest Solution

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Introduction :

A scanner is a device that reads an image and converts it into a digital format. Scanners are used for converting paper documents into digital files, as well as for digitizing old photographs. The more common types of scanners are flatbed scanners and sheet-fed scanners. They differ in terms of size and capabilities: flatbed scanners can scan large items, such as books or posters, while sheet-fed scanners usually scan smaller objects, such as photos or pages made of text. Visit Trendsitemreview 

There are many ways to close a scanner in Java. But not all of them work for all types of scanners. Here is the simplest way that works for most flatbed and sheet-fed scanners:

The Simplest Solution

After reading a couple of posts on this site about how you can close the java scanner, I decided to take the most simple and intuitive approach available. As expected, the examples provided were pretty complex and involved a lot of Java code. So, I decided to make it really easy by generating a simple file that will do the job and you only have to fill in the last few lines with some command lines.

In fact, I have simplified everything in the examples, so you will not need to do much at all. Just type one command line at the end of the last command line that closes the scanner.

After running that code, you can confirm that the scanner will close by pressing F10.

The source code for that simple program is now available in this blog’s GitHub repository.

Create the Scanner

Let’s set up a scanner of some sort. For instance, we have some POS tags on our board that we want to read. That sounds easy enough. In any case, we’ll start out with a class that has a constructor, a method, and a getter. I call this the Scanner class. It is basically a System.out.println() method that increments a counter.

The constructor will have the constructor’s parameters read, plus two ints. The class will look like the following:

public class Scanner { private int counter; private Scanner(int in) { this.counter = in; } public Scanner(int in, Scanner() o) { this.counter++; } public void increment() { Scanner.counter++; } }

The increment() method simply increments the Scanner’s counter. Since there is a constructor, the class has no getter. It only has the increment() method.

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Building the Scanner

We need to build an empty Scanner object that we can close when we’re done. In a distributed system, it is impossible to guarantee that each component of the system is always available. We also need to consider that our Scanner may make calls to other components, perhaps implementing the result of a scan or some other operation.

At the most basic level, we could ensure that the Scanner in its entirety is available at all times. However, we must recognize that this isn’t always feasible, particularly in an application with very complex architecture. Sometimes the Scanner is used only as a wrapper around some other resource, so the implementation of a Scanner may be minimal and not a critical part of the application.

  • Closing the Scanner

  • Click here to download the finished project.
  • Closing the Scanner
  • Close all Scanner-related folders
  • Go to Files > Restart Server and select Close Scanner.

This is the way you can close the Scanner and restarts the server when you have completed the project. It’s super simple.

Software Solutions Here’s a list of Java solutions to help you close a scanner: Handy

  • ClipMat

  • This is a unique solution to close a Scanner
  • Under the Hood Close the Scanner in Java (How)
  • How to Close a Scanner (Java) using Closures
  • Closing a Scanner in Java (How)

You can take a closer look at the Java code that explains the closing of the Scanner.

Step to step guide to closing a scanner 

If you find your scanner isn’t behaving as you like it, you can try a few ways to close it down. This can help you make sense of your scanned data and avoid any breakage of records.

This guide is mostly based on a scan of an A4 sheet with the following methods used:

  • File.close
  • Decrypting the trays/boxes:
  • Reading and converting scanned pages into a format you can understand:
  • You can read the original PDF here

Have trouble seeing the pictures? We have a tool in the MyEclipse Online Community called Scan to Image that helps you scan and convert scanned documents into a usable format for further processing.

Check it out:

The algorithm for the output is pretty cool. We will take a look at it shortly.

  • Pron

I hope you can help me with this very useful little Java snippet.

In Java, when a scanline is created, it is disabled after one scanline and returned when the scanline is released. So this snippet should show the right behavior:

Scanline.forEach { line -> // … and another line // … } 1 Scanline . forEach { line -> // … and another line // … }

Where can I find that snippet?

Simon Backes


I’ve made a java log for this if you want to see how it was implemented.

Just open up a java file (and I think you already have the java class in there), and you should see the following output.

ScanlineReader ScanlineReader_1-1 1 2 ScanlineReader ScanlineReader_1-1

Let’s get back to our scanline reader.

  • Crowns

This tutorial shows you how to do it.

Even though JScanner is a pretty simple project, it has one of the hardest parts to do correctly: closing the scanner. There are several different ways to do this: one of them is simply closing the window and re-opening it later, but if you want to do it properly then it’s better to learn the correct solution.

This tutorial shows you how to do it.

Cron is an e-mail notification tool that was written for Linux. In Cron, you create little jobs that run once a day at a certain time and process the incoming mail.

If you are using a scanner and you need to process the incoming mail from your IPython and Screen backend you can use the Cron job below and it will do the job properly.

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Final thought 

Completing a task with a closing statement is another of the more common pieces of Java code. In this article, we will look at a popular way to close a scanner. There are three versions to consider when doing so:

First, you could close the class by creating a read-only field; then, assign the resulting read-only value to the closing statement.

Second, you could create a static field, allocate it, and assign the closing value from there.

Third, you could use the finalizer to close the class.

I’ll be using the ReaderScanner in my examples. But I want you to know it is quite possible to do the same in a Reactor. You can access the scanning code in the resource module.

A ReaderScanner can be created with a String value that contains the Scanner class name.

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