我的程序不執行if語句中的代碼

Question

我創建了一個程序，該程序可以創建一個目錄，然後在該目錄中放置一個文件。正如你所看到的，在這個人指定目錄之後，程序應該檢查目錄是否存在，如果目錄不存在或創建一個目錄，或者說已經有一個具有該目錄的目錄。每當我運行該程序，並且我放入一個已經存在的目錄時，而不是說該目錄已經存在，它會直接跳到失敗消息，並繼續在現有目錄中創建新文件。我該如何修復代碼，以便它能提供正確的「文件存在」消息，然後繼續執行代碼，而不是僅僅說出失敗消息？

Please enter where you want your file... 
/Users/FyuZheN/Desktop/test 
[Console] Directory does not exist! Creating one... 
[Console] Fail! Couldn't create directory! 
[Console] What would you like to call your new file? 
test.jar 
[Console] Created new file test.jar 
Successfully created new file: /Users/FyuZheN/Desktop/test/test.jar 

此外，如果用戶指定的目錄是不能存在的目錄。這種情況發生......

Please enter where you want your file... 
awdawdawd 
[Console] Directory does not exist! Creating one... 
[Console] Success! Created directory awdawdawd 
[Console] What would you like to call your new file? 
dawdawd 
[Console] Created new file dawdawd 
Successfully created new file: awdawdawd/dawdawd 

我怎樣才能重新編碼，以便它給出了正確的錯誤消息，並再次要求用戶一個有效的目錄？

代碼：

import java.awt.*; 
import java.io.*; 
import java.util.*; 

public class findFile { 

public static void main (String[] args) throws IOException { 

    Scanner s = new Scanner(System.in); 
    boolean success = false; 

    System.out.println("Please enter where you want your file..."); 
    String usrdir = s.nextLine(); 

    File directory = new File(usrdir); 

    if (directory.exists() && directory.isFile()) { 

     System.out.println("[Console] This directory already exists"); 

    } else { 

     System.out.println("[Console] Directory does not exist! Creating one..."); 
     success = directory.mkdir(); 

     if (success) { 

      System.out.println("[Console] Success! Created directory " + usrdir); 

     } else { 

      System.out.println("[Console] Fail! Couldn't create directory!"); 
     } 
    } 

    System.out.println("[Console] What would you like to call your new file?"); 
    String filename = s.next(filename = ".txt"); 

    File f = new File(directory, filename); 

    if(f.exists() && f.isFile()) { 

     System.out.println("[Console] File already exists!"); 

    } else { 

     System.out.println("[Console] Created new file " + filename); 
     success = f.createNewFile(); 

     if (success) { 

      System.out.printf("Successfully created new file: %s%n", f); 

     } else { 

      System.out.printf("Failed to create new file: %s%n", f); 
     } 
    } 

    s.close(); 
} 
} 

Answer 1

要使代碼再問，做某事喜歡：

while(true){ 
//ask for new foldername 
if(usrdir.equals("exit")){ 
    break;//the user should be able to.leave your program 
} 
//rest of your code 
} 

要創建一個新的文件，你需要一個文件夾，這樣做：

boolean folderexists=false; 
//if folder creation worked or if folder exists set to true 
if(folderexists){ 
//ask for filename etc 
}