Filters files based on the extension (what the filename ends with) : FileFilter « File « Java Tutorial

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import java.io.File;
import java.io.FilenameFilter;

/**
 * This filters files based on the extension (what the filename
 * ends with). This is used in retrieving all the files of a
 * particular type.
 *
 * Eg., to retrieve and print all <code>*.java</code> files in the current directory:
 *
 * <pre>
 * File dir = new File(".");
 * String[] files = dir.list( new ExtensionFileFilter( new String[]{"java"} ) );
 * for (int i=0; i&lt;files.length; i++)
 * {
 *     System.out.println(files[i]);
 * }
 * </pre>
 *
 * @author  Federico Barbieri <fede@apache.org>
 * @author Serge Knystautas <sergek@lokitech.com>
 * @author Peter Donald
 * @version CVS $Revision: 494012 $ $Date: 2007-01-08 11:23:58 +0100 (Mo, 08 Jan 2007) $
 * @since 4.0
 */
public class ExtensionFileFilter
    implements FilenameFilter
{
    private String[] m_extensions;

    public ExtensionFileFilter( final String[] extensions )
    {
        m_extensions = extensions;
    }

    public ExtensionFileFilter( final String extension )
    {
        m_extensions = new String[]{extension};
    }

    public boolean accept( final File file, final String name )
    {
        for( int i = 0; i < m_extensions.length; i++ )
        {
            if( name.endsWith( m_extensions[ i ] ) )
            {
                return true;
            }
        }
        return false;
    }
}