Example of Dir Stack

package Horstmann.Cay;
 
/**
 * @version 1.10 1999-07-07
 * @author Cay Horstmann
 */
 
import java.io.File;
import java.io.IOException;
import java.util.Stack;
 
public class DirStack {
    public static void main(String[] args) {
	Stack directoryStack = new Stack();
	File root = new File(File.separator + ".");
	directoryStack.push(root);
	while (directoryStack.size() > 0) {
	    File currentDirectory = (File) directoryStack.pop();
	    System.out.println(currentDirectory);
	    String[] subdirectories = currentDirectory.list();
	    if (subdirectories != null) {
		for (int i = 0; i < subdirectories.length; i++) {
		    try {
			String fname = currentDirectory.getCanonicalPath()
				+ File.separator + subdirectories[i];
			File f = new File(fname);
 
			if (f.isDirectory())
			    directoryStack.push(f);
		    } catch (IOException e) {
			System.out.println(e);
		    }
		}
	    }
	}
    }
}