Locating a class file path from other class

[mythily prakash]

HI all,
I have to write a program to get the original path of the class file.That is, my program will get the location of the given file not in the current directory or the same class executing the program.Bcoz, i read many pages returning the codings of getting the location of the running class.Many suggested to use

    URL ur=getClass().getProtectionDomain().getCodeSource().getLocation();
 
 or
   class myClass{
   ....
  //  main
    ...
    String str=myClass.class.getResource("myClass.class");
    ...
   }

Both the things will return the file path of myClass.class. But i want to get any class file in random location and should return its path.
Like my1.class is the class grasping the file location in some C:\MyDir\my1.class

Some file called my2.class in D:\ or C:\MyDir\MyClass\ or some other location

Pls help me to get it in a rite way.

Thanks in Advance,
Mythily.

[Ernest Friedman-Hill]

Hi,

Welcome to JavaRanch!

For every loaded class, there's an instance of 'java.lang.Class' which represents it. The method getClass() returns the java.lang.Class object for an instance of that class. You're calling getClass() on the current instance, so you're getting the location of the class where this code appears. To get the location of my.class, you need to use one of the following:

new my().getClass().getProtectionDomain()...

Class.forName("my").getProtectionDomain()...

my.class.getProtectionDomain()...

Any of these three will call getProtectionDomain() on the java.lang.Class instance for the class "my". The second one is handy if you won't know the name of the class you're interested in until runtime, because there the class appears only as a String -- you could use a runtime variable there.

[Adam Richards]

Check out the Java Almanac on this, too.

[mythily prakash]

hi,
I got it at last.This will find any file irrsepective of its location. Initially my Program starts it search for C drive only.

// File Path Finder
 
import java.io.File;
public class filfind {
private boolean flag = false;
public filfind() {
  super();
 }
 private void find(File directory,String strFile) 
 {
  if(directory.isDirectory())
  {
   File[] listing = directory.listFiles();
   
   getFilesOnly(listing,strFile);
   
   if(!flag)
   {
   
    File[] dir = getDirectoriesOnly(listing);
    if(dir != null)
     for (int i = 0; !flag && i < dir.length && dir[i] != null ; i++) {
      if(dir[i].isDirectory())
       find(new File(directory + File.separator +dir[i].getName()),strFile);
     }
   }
  }
  
 }
 
 private File[] getDirectoriesOnly(File[] file)
 {
  File[] f = new File[file.length];int j=0;
  for (int i = 0; i < file.length; i++) {
   if(file[i].isDirectory())
   {
    f[j] = file[i];j++;
   } 
  }
  return (j ==0) ? null : f;
 }
 
 private void getFilesOnly(File[] file,String strFileName)
 {
  File[] f = new File[file.length];
  for (int i = 0,j=0; i < file.length; i++) {
   if(file[i].isFile() && file[i].getName().equals(strFileName))
   {
    flag = true;
    System.out.println("\nPATH : "+file[i].getPath());
    break;
   } 
  }
 }
 /**
  * @param args
  */
 public static void main(String[] args) throws Exception{
 
  filfind f = new filfind(); 
  f.find(new File("c:/"),args[0]);
  if(!f.flag)
   System.out.println("Not Found");
 
}
}

my special thanks to Mr.Santhosh who helped me all the way to get the coding.

Thanks,