Ls directory lister modified to use FilenameFilter : File Commands « File Input Output « Java

1. Java
2. File Input Output
3. File Commands

Ls directory lister modified to use FilenameFilter

    
/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

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

/**
 * FNFilter - Ls directory lister modified to use FilenameFilter
 * 
 * @author Ian Darwin
 * @version $Id: FNFilter.java,v 1.3 2004/03/11 03:33:35 ian Exp $
 */
public class FNFilter {
  public static void main(String argh_my_aching_fingers[]) {
    // Generate the selective list, with a one-use File object.
    String[] dir = new java.io.File(".").list(new OnlyJava());
    java.util.Arrays.sort(dir); // Sort it (Data Structuring chapter))
    for (int i = 0; i < dir.length; i++)
      System.out.println(dir[i]); // Print the list
  }
}

/**
 * This class implements the FilenameFilter interface. The Accept method returns
 * true for .java, .class and .jar files.
 */

class OnlyJava implements FilenameFilter {
  public boolean accept(File dir, String s) {
    if (s.endsWith(".java") || s.endsWith(".class") || s.endsWith(".jar"))
      return true;
    // others: projects, ... ?
    return false;
  }
}



           
         
    
    
    
  

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