HiddenFileFilter (Commons IO 2.5)
Date: 2016-12-01

org.apache.commons.io.filefilter

## Class HiddenFileFilter

- java.lang.Object
- - org.apache.commons.io.filefilter.AbstractFileFilter
  - - org.apache.commons.io.filefilter.HiddenFileFilter

- All Implemented Interfaces:
    java.io.FileFilter, java.io.FilenameFilter, java.io.Serializable, IOFileFilter

      public class HiddenFileFilter
      extends AbstractFileFilter
      implements java.io.Serializable

  This filter accepts `File`s that are hidden.

  Example, showing how to print out a list of the current directory's hidden files:

       File dir = new File(".");
       String[] files = dir.list( HiddenFileFilter.HIDDEN );
       for ( int i = 0; i < files.length; i++ ) {
           System.out.println(files[i]);
       }

  Example, showing how to print out a list of the current directory's visible (i.e. not hidden) files:

       File dir = new File(".");
       String[] files = dir.list( HiddenFileFilter.VISIBLE );
       for ( int i = 0; i < files.length; i++ ) {
           System.out.println(files[i]);
       }

  Since:
    1.3
  Version:
    $Id: HiddenFileFilter.java 1642757 2014-12-01 21:09:30Z sebb $
  See Also:
    Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static IOFileFilter` | `HIDDEN` Singleton instance of hidden filter
    `private static long` | `serialVersionUID`
    `static IOFileFilter` | `VISIBLE` Singleton instance of visible filter

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `HiddenFileFilter()` Restrictive consructor.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `accept(java.io.File file)` Checks to see if the file is hidden.

    - ### Methods inherited from class org.apache.commons.io.filefilter.AbstractFileFilter

      `accept, toString`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### serialVersionUID

          private static final long serialVersionUID

      See Also:
        Constant Field Values

    - #### HIDDEN

          public static final IOFileFilter HIDDEN

      Singleton instance of hidden filter

    - #### VISIBLE

          public static final IOFileFilter VISIBLE

      Singleton instance of visible filter

  - ### Constructor Detail

    - #### HiddenFileFilter

          protected HiddenFileFilter()

      Restrictive consructor.

  - ### Method Detail

    - #### accept

          public boolean accept(java.io.File file)

      Checks to see if the file is hidden.
      Specified by:
        `accept` in interface `java.io.FileFilter`
      Specified by:
        `accept` in interface `IOFileFilter`
      Overrides:
        `accept` in class `AbstractFileFilter`
      Parameters:
        `file` - the File to check
      Returns:
        `true` if the file is hidden, otherwise `false`.

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