// this file contains some methods for creating and deleting a folder and a file

//1. create a folder

public void createDir(String path)...{

File dir=new File(path);

if(!dir.exists())

dir.mkdir();

}

//2. create a new file

public void createFile(String path,String filename) throws IOException...{

File file=new File(path+"/"+filename);

if(!file.exists())

file.createNewFile();

}

//3. delete a file

public void delFile(String path,String filename)...{

File file=new File(path+"/"+filename);

if(file.exists()&&file.isFile())

file.delete();

}

//4. delete a folder

public void delDir(String path)...{

File dir=new File(path);

if(dir.exists())...{

File[] tmp=dir.listFiles();

for(int i=0;i<tmp.length;i++)...{

if(tmp[i].isDirectory())...{

delDir(path+"/"+tmp[i].getName());

}

else...{tmp[i].delete();

}

}

dir.delete();

}

}