API methods in Java summary

API Methods

File = File new new File (path); # Create a file object, point to a directory 
file.exists () # determine whether the directory or file exists 
File [] Files = File.listFiles (); # Get the current directory and all the files in the directory 
f.isDirectory () # judge is a directory or file 
f.getAbsolutePath () # get the absolute file path

Use demo,

public  static List <String> getFileName (the dir String, List <String> the fileList) {
         // the dir string into File file object, using the api implementation requirements File 
        File file = new new File (the dir); // use file method listFiles (), return all the file directory + (just in the current directory, subdirectory is not included) in this path 
        file [] = files File.listFiles ();
         for (file F: files) {
             IF (f.isDirectory ()) { // recursive
                 // must have an end condition, for loop will eventually end, the method returns 
                getFileName (f.getAbsolutePath (), the fileList); 
            } the else { 
                fileList.add (f.getAbsolutePath ()); //
            }
        }
        return fileList;
        
    }