查看这个问题。
使用...

  String home = System.getProperty（user.home）; 
文件文件=新文件（home +/ Downloads /+ fileName +.txt）; 
 

I have a DownloadTask class in java that takes a filename and URL, downloads that file and saves it to the downloads folder.

To save it to my downloads folder, I have the line

File file = new File("/users/myName/Downloads" + fileName + ".txt");

What can I replace this path with so that anyone can run the program and the file will be saved to their downloads folder?

Check out this question. Use...

String home = System.getProperty("user.home");
File file = new File(home+"/Downloads/" + fileName + ".txt");