How to search files with Java

[karma]

I want to search for a specific file in the computer and I want know if the file exists and if so I want to know the path of it. Does anybody know how can i do this?

[FaRuK]

The following is a sample, and may have rooms for improvement.
To perform this, after compiling, enter a command as a command line input

java FindFilterdFile [directory from which serch begins] [filter]

For example like this.

java FindFilterdFile "C:\\" ".jpg"

import java.util.*;
import java.io.*;

final public class FindFilteredFile { 

 final static void perform(File Dir, MyFilter filtr) throws IOException{

    if (Dir==null) return;
    File[] filtered = Dir.listFiles(filtr);
    if (filtered==null) return;
    Arrays.sort(filtered);

    for(int i = 0; i < filtered.length; i++){//print Filtered Filename
             if(filtered[i].isFile()) {
                    System.out.println(filtered[i].getCanonicalPath()); 
                   }
            }   //end of for
        }     

 final public static void main(String[] args) {

    if(args.length !=2){
            System.out.println("Enter path and filter.");
            return;
            }
    File iDir = new File(args[0].trim());  //e.g. "."
    MyFilter filt = new MyFilter(args[1].trim()); //e.g.".jpg"
    if(!(iDir.exists())||(iDir.isFile())){
    	System.out.println("Directory does not exist.");
        return;
        }
      FindDir finder = new FindDir();
      ArrayList objs = null;

 try{ 
    objs = finder.getDs(iDir);
     }catch(Exception e){e.printStackTrace();}

     finder = null;

     try{
        Thread.sleep(400);// affords to run back ground
        System.gc();
        }catch(InterruptedException trx){;}
     try{
    Collections.sort(objs);
    Iterator it = objs.iterator();
    while(it.hasNext()){
        FindFilteredFile.perform((File)(it.next()), filt);
    } 
    }catch(IOException iioo){iioo.printStackTrace();}
       return;
    }  //end of main
}  //end of FindFilteredFile
final class FindDir{
	private ArrayList objD;
   FindDir(){
        this.objD = new ArrayList();	
     }
public ArrayList getDs(File givendir){
    this.enumDs(givendir);
    return this.objD;
}
 private final void enumDs(File dir){
      (this.objD).add(dir);
      File[] dirArr = dir.listFiles();
     if (dirArr==null) return;
     for(int i=0;i < dirArr.length;i++){
        if(dirArr[i].isDirectory()){
	  this.enumDs(dirArr[i]);
        }else{continue;} //end of if
	}  //end of for
	dirArr = null;
  }
}  //end of FindDir
 
 
final class MyFilter implements FilenameFilter {
  String extension; String f;
  MyFilter(String ext) { this.extension = ext; }
  public boolean accept(File directory, String f_name) {
    f = new File(f_name).getName();
    boolean result = (f.indexOf(extension) !=-1);
    f = null;
    return result;
  }
}