我想重命名一个文件，但不工作，我不知道哪里出错了 [英] i want to rename a file but don't work ,i don't know where is wrong

问题描述

import java.io.File;
import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Scanner;

public class FileAndDirectoryInfo{
   public static void main(String[]args)throws IOException {
       
           
       Scanner input = new Scanner(System.in);
       System.out.println("Enter file or directory name");
  
       Path path = Paths.get(input.nextLine());
       if(Files.exists(path)){  
           // display file (or directory)information
           System.out.printf("%n%s", path.getFileName());
           System.out.printf("Path:%n" , path);
      
           System.out.printf("%s,a directory%n", Files.isDirectory(path) , "Is:" +" Is not");
           System.out.printf("Last modified: %s%n" , Files.getLastModifiedTime(path));
           System.out.printf("Size:%s%n",Files.size(path));
           
          
           if(Files.isDirectory(path)) 
           {
               System.out.printf("%nDirectory contents:%n");
               
               DirectoryStream<path> directoryStream = Files.newDirectoryStream(path);
               for (Path p : directoryStream)
                   System.out.println(p);
           
           }
       }
       else 
       {
           System.out.printf("%s does not exist%n" , path);
       }
        boolean success = false;
        System.out.println("Enter path of directory to create");
        String dir = input.nextLine();
        // Creating new directory in Java,if it doesn't exists
        File directory = new File(dir);
        if(directory.exists() && directory.isDirectory()){
        System.out.println("Directory already exists ...");
        }else{
            System.out.println("Directory not exists,creating now");
            success= directory.mkdir();
            if(success)
            {
                System.out.printf("Successfully created new directory:%s%n",dir);
            }else{
                System.out.printf("Failed to create new directory:%s%n",dir );
               
        }
    }
     System.out.println("Enter file name to be renamed");
     String filename = input.nextLine();
     File f = new File(filename);
     if(f.exists()&& f.isFile())
     {
         System.out.println("Rename File");
         success = f.renameTo(f);
         System.out.println("The name is:%n");
         String rename = input.nextLine();
     File h = new File(filename);
         if(h.exists() && f.renameTo(f))
         {
             System.out.println("The folder was renamed");
         }
         if(success)
         {
             System.out.printf("Successfully created new name :%s%n", f);
         
     }else{
         System.out.printf("Failed to created new name :%s%n",f);
     }
     
     }
     input.close();
   }
}

推荐答案

你声明了main方法所在的类。

you declare the class public where main method is present.

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