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POJFileChooser's anomaly with MyComputer in Windows
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  1. POJFileChooser's anomaly with MyComputer in Windows
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    copied!<p>I created a file chooser using swing to select only images from a windows platform. I used a <code>FileFilter</code> to do that. The code of the <code>accept()</code> method overridden form the <code>FileFilter</code> class is: </p> <pre><code>public boolean accept(File f) { System.out.println("File is : " + f.getName() + " " + f); if(f.isDirectory()) return true; String ext = getExtension(f); // returns extensions of the files. if(ext.equals("jpg") || ext.equals("jpeg") || ext.equals("gif") || ext.equals("tif") || ext.equals("tiff")) return true; else { return false; } </code></pre> <p>It hangs when <code>MyComputer</code> is selected form the windows desktop. The following is the entry i get for MyComputer:</p> <p><code>File is ::{20D04FE0-3AEA-1069-A2D8-08002B30309D} Computer</code></p> <p>And the following is the error message I get:</p> <pre><code>File is ::{20D04FE0-3AEA-1069-A2D8-08002B30309D} Computer File is lenovo C:\Users\lenovo File is ::{F02C1A0D-BE21-4350-88B0-7367FC96EF3C} Network File is ::{031E4825-7B94-4DC3-B131-E946B44C8DD5} Libraries File is 4s.txt C:\Users\lenovo\Desktop\4s.txt File is cs.bat - Shortcut.lnk C:\Users\lenovo\Desktop\cs.bat - Shortcut.lnk File is kaushik.txt C:\Users\lenovo\Desktop\kaushik.txt File is rel.txt C:\Users\lenovo\Desktop\rel.txt File is SQL Developer.lnk C:\Users\lenovo\Desktop\SQL Developer.lnk File is Get Started With Oracle Database 11g Express Edition .lnk C:\Users\Public\Desktop\Get Started With Oracle Database 11g Express Edition .lnk </code></pre> <p>The following is displayed after double-clicking myComputer:</p> <pre><code>File is ::{416651E4-9C3C-11D9-8BDE-F66BAD1E3F3A} ::{20D04FE0-3AEA-1069-A2D8-08002B30309D}\::{416651E4-9C3C-11D9-8BDE-F66BAD1E3F3A} Exception in thread "Basic L&amp;F File Loading Thread" java.lang.NullPointerException at gui.ImageFilter.accept(ImageFilter.java:26) at javax.swing.JFileChooser.accept(JFileChooser.java:1576) at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread$1.call(BasicDirectoryModel.java:230) at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread$1.call(BasicDirectoryModel.java:216) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at sun.awt.shell.Win32ShellFolderManager2$ComInvoker$3.run(Win32ShellFolderManager2.java:458) at java.lang.Thread.run(Thread.java:619) </code></pre> <p>However when i add another <code>if</code> condition right after <code>ext</code> is initialized: </p> <pre><code>if (ext == null) return false; </code></pre> <p>It runs fine. My question is if <code>MyComputer</code> is a directory why it was bothered by the <code>null</code> test? Shouldn't it have returned <code>true</code> at the directory test? On the other hand, if it is not a directory (which makes it a file, right?), then how is it still returning <code>true</code> and getting opened by the file chooser? Or is their some other exceptional angle to it?</p> <p>Thanx in advance!</p>
 

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