在java中获取目录名称

Question

How do I get the directory name for a particular java.io.File on the drive in Java?

For example I have a file called test.java under a directory on my D drive.

I want to return the directory name for this file.

Answer 1

File file = new File("d:/test/test.java");
File parentDir = file.getParentFile(); // to get the parent dir 
String parentDirName = file.getParent(); // to get the parent dir name

Remember, java.io.File represents directories as well as files.

Answer 2

With Java 7 there is yet another way of doing this:

Path path = Paths.get("d:/test/test.java"); 
Path parent = path.getParent();
//getFileName() returns file name for 
//files and dir name for directories
String parentDirName = path.getFileName().toString();

I (slightly) prefer this way, because one is manipulating path rather than files, which imho better shows the intentions. You can read about the differences between File and Path in theLegacy File I/O Code tutorial

Answer 3

Note also that if you create a file this way (supposing "d:/test/" is current working directory):

File file = new File("test.java");

You might be surprised, that both getParentFile() and getParent() return null. Use these to get parent directory no matter how the File was created:

File parentDir = file.getAbsoluteFile().getParentFile();
String parentDirName = file.getAbsoluteFile().getParent();

Answer 4

File file = new File("d:/test/test.java");
String dirName = file.getParentFile().getName();

Answer 5

Say that you have a file called test.java in C:\\\\myfolder directory. Using the below code, you can find the directory where that file sits.

String fileDirectory = new File("C:\\myfolder\\test.java").getAbsolutePath(); 
fileDirectory = fileDirectory.substring(0,fileDirectory.lastIndexOf("\\"));

This code will give the output as C:\\\\myfolder