import java.io.File;

public class DeleteFolder {

    /**
     * 刪除文件夾下的所有文件
     * @param oldPath
     */
    public void deleteFile(File oldPath) {
          if (oldPath.isDirectory()) {
           System.out.println(oldPath + "是文件夾--");
           File[] files = oldPath.listFiles();
           for (File file : files) {
             deleteFile(file);
           }
          }else{
            oldPath.delete();
          }
        }

    public static void main(String[] args) {
        DeleteFolder df =  new DeleteFolder();
        df.deleteFile(new File("E:/ddd/"));
    }
}