get all Folder names and create the folder

CreateFolders.java

package com.din.pack;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;



public class CreateFolders {

	public static void main(String[] args) throws IOException {


		BufferedReader abc = new BufferedReader(new FileReader(new File("D:/PT/Projects/current/1/bwb/paths/paths.txt")));
		List<String> lines = new ArrayList<String>();
		String line = null;
		while((line = abc.readLine()) != null) {
			lines.add(line);
		}
		abc.close();

		// If you want to convert to a String[]
		String[] paths = lines.toArray(new String[]{});
		File f = null;

		for (int j = 0; j < paths.length; j++) {

			//System.out.println(paths[j]);
			paths[j] =paths[j].replaceAll("V2016.2.1_RC1", "V2017.1.0_RC1"); //RC version change 
			paths[j] =paths[j].replaceFirst("2.1", "2017.1.0"); //top level folder
			//System.out.println(paths[j]);
			f = new File(paths[j]);
			f.mkdirs();
		}
		System.out.println("folders created");
	}


}

GetAllFolderNames.java

package com.din.pack;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class GetAllFolderNames {

	
	public static void main(String[] args) {
		   //Path parent = FileSystems.getDefault().getPath("D:/PT/Projects/current/1/bwb/2.1");
		   List<File> l = getDirs(new File("D:/PT/Projects/current/1/bwb/2.1"), 2); //level 0 is parent , level 1, and so on
		   String[] paths = new String[l.size()];
		   int i = 0;
		   for (File file : l) {
			paths[i++] = file.getAbsolutePath();
		}
		   File  f = null;
		   for (int j = 0; j < paths.length; j++) {
			  System.out.println(paths[j]);
			   paths[j] =paths[j].replaceAll("V2016.2.1_RC1", "V2017.1.0_RC2");
			   paths[j] =paths[j].replaceFirst("2.1", "2017.1.0"); //top level folder
			//System.out.println(paths[j]);
			  f = new File(paths[j]);
			  f.mkdirs();
			  
		}
		   System.out.println("folders created");
	}
	  static List<File> getDirs(File parent, int level){
	    List<File> dirs = new ArrayList<File>();
	    for(File f: parent.listFiles()){
	        if(f.isDirectory()) {
	             if (level==0) dirs.add(f);
	             else if (level > 0) dirs.addAll(getDirs(f,level-1));
	        }
	    }
	    return dirs;
	}
	
	
	

}