(File operation) Comprehensive case: List the directory structure

Comprehensive case: List all files in the specified directory

Now it is up to the developer to set a directory path arbitrarily. Then list all the file information under this directory, including all files in the subdirectory.

Implementation class:

  public static void listDir(File file){
        if(file.isDirectory()){ //是一个目录
            File[] results = file.listFiles();  //列出目录中的全部内容
            if(results != null){
                for(int x = 0;x<results.length;x++){
                    listDir(results[x]);    //继续依次判断
                }
            }
        }else{  //不是一个目录
            System.out.println(file);
        }
    }

Main method:

public static void main(String[] args) throws IOException {
        File file = new File("E:"+File.separator); //File.separator表示分隔符
        listDir(file);
}

If the path is now a delete operation, then the path is completely deleted