Java recursively traverses files in folders and subfolders

Not much to say, just go to the code

import java.io.File;

public class file {     public static void main(String[] args){         File file=new File("C:/HWKJ/file");         filesDirs(file);     }     //Use recursive traversal of files in folders and subfolders     public static void filesDirs(File file){         //The File object is the path of a file or folder, the first layer judges whether the path is empty         if(file!=null){             //The second layer path is not empty, it is judged to be a file Folder or file             if(file.isDirectory()){                 //Enter here to indicate that it is a folder. At this time, you need to get all the files under the current folder, including the directory                 File[] files=file.listFiles();//Note: here You can only use listFiles(), not list()                 //All the contents under files may be folders or files, so you need to judge whether it is a file or a folder one by one. This judgment process is the method encapsulated here                 //So you can call yourself to judge and implement recursion                 for (File flies2:files) {















                    filesDirs(flies2);
                }
            }else{                 System.out.println("file name"+file);             }         }else{             System.out.println("file does not exist");         }

    }
}