public void deleteFolder(File file) {
if(file.isDirectory()){
File[] files = file.listFiles();
for(File f:files){
deleteFolder(f);
}
}
file.delete();
}

public void deleteFolder(File file) {
if(file.isDirectory()){
File[] files = file.listFiles();
for(File f:files){
deleteFolder(f);
}
}
file.delete();
}