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POScanner - managing input from text file
 

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  1. POScanner - managing input from text file
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    <p>I’m working with java Scanner trying to extract product information from a text file called Inventory.txt. </p> <p>This file contains data on products in this format:</p> <pre><code>“Danelectro|Bass|D56BASS-AQUA|336177|395.00Orange|Amplifier|BT1000-H|319578|899.00Planet Waves|Superpicks|1ORD2-5|301075|4.50Korg|X50 Music Synthesizer|X50|241473|735.00Alpine|Alto Sax|AAS143|198490|795.00” </code></pre> <p>I am trying to parse the strings and add them into an arraylist such that each element in the arraylist would look something like this:</p> <pre><code>"Danelectro|Bass|D56BASS-AQUA|336177|395.00" "Orange|Amplifier|BT1000-H|319578|899.00" "KorPlanet Waves|Superpicks|1ORD2-5|301075|4.50" "g|X50 Music Synthesizer|X50|241473|735.00" "Alpine|Alto Sax|AAS143|198490|555.00” </code></pre> <p>Following is my code:</p> <pre><code>public class ItemDao { public ItemDao() { scanFile(); } public void scanFile() { Scanner scanner; ArrayList &lt;String&gt; content = new ArrayList &lt;String&gt;(); try { Pattern p1 = Pattern.compile("\\.[0-9]{2}$"); scanner = new Scanner(new File("Inventory.txt")); while (scanner.hasNext(p1)) { content.add(scanner.next(p1)); } for (String item : content) { System.out.println("Items:" + item); } } catch (FileNotFoundException e) { e.printStackTrace(); } } } </code></pre> <p>When I tested this code I found that the arraylist is empty. Any help would be much appreciated.</p> <p>java -jar A00123456Lab5.jar</p> <p>Create an ItemDAO class in a dao package This class will contain an static inner class which implements Comparator (DAO = Data Access Object)</p>
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    1. This table or related slice is empty.
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    1. USskaffman
    1. USuser1391337
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. COHave you tested the String extracted inside of the while loop, to see if the regex pattern is faulty? Please let us know the results of your efforts to debug this.
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      1. USHovercraft Full Of Eels
    2. COThanks for the follow up. When I tested my while loop using this regex "\\.[0-9]{2}$" I did not no elements got passed into my the content ArrayList.
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    3. COI refined my regex to "(.+[\\|]){4}.+[0-9]\\.[0-9]{2}?" and now I am adding first two Strings into the ArrayList but for some reason not all. Nevertheless, I think that the bug is in my regex.
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      1. USuser1391337
 

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