import java.io.File;

public class RemoveDirTest {

    public static void main(String[] args) {

        File dir = new File("F:\\SogouWP");

        removeDir(dir);

    }

    public static void removeDir(File dir) {

        File[] files = dir.listFiles();

        for(File file : files){

            if(file.isDirectory()){

                removeDir(file);

            }else{

                file.delete();

            }

        }

        dir.delete();

    }

}