get folder name from absolute path of a file

Sample.java

import java.io.File;
import java.util.Stack;
import java.util.StringTokenizer;


public class Sample {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
//		System.out.println(splitbyslash("/hello/world/today/sample.mdb"));

		System.out.println(get_folder_name("/home/komo2/Dropbox/doc/mdb2/sample.mdb"));
	}

	public static int splitbyslash(String line){
		
		
		Stack<String> mDirectorys = new Stack<String>();
		
		
		StringTokenizer token = new StringTokenizer(line,"/");
		
		String str_tmp = "/";
		
		mDirectorys.push(str_tmp);

		System.out.println(str_tmp);

		while(token.hasMoreTokens()){
			
			str_tmp = str_tmp  + token.nextToken() + "/";
			mDirectorys.push(str_tmp);
			
			System.out.println(str_tmp);
			
		}
		
		System.out.println("-------");
		mDirectorys.pop();
		System.out.println(mDirectorys.pop());
		
		
		System.out.println("-------");
		
		
		
		while(mDirectorys.size()>0){
			System.out.println(mDirectorys.pop());
			
		}
		
		
		
		
		return line.length();
		
	}
	
	
	public static String get_folder_name(String line){
		
		
		Stack<String> mDirectorys = new Stack<String>();
		StringTokenizer token = new StringTokenizer(line,"/");
		
		String str_tmp = "/";
		mDirectorys.push(str_tmp);

		while(token.hasMoreTokens()){
			str_tmp = str_tmp  + token.nextToken() + "/";
			mDirectorys.push(str_tmp);
		}
		
		String folder_name;
		while(true){
			folder_name =mDirectorys.pop();
		
			File folder0 = new File(folder_name);
		
				if(folder0.isDirectory()){
					return folder_name;
				}
			folder0=null;	
		}
	}

}