In Java, how do I check if something is a directory, and if not, throw an exception?

Question

I've created this new object:

File dir = new File(userHome + "//data")

In another class, I want verify that 'dir' is a directory and if it isn't, throw an IllegalArgumentException.

My goal is to then locate specific file types in that directory (if a directory) and process them.

possible duplicate of http://stackoverflow.com/questions/15571496/how-to-check-if-a-folder-exists — blairmeister, Apr 24 '15 at 14:59

score 4 · Accepted Answer · edited Apr 24 '15 at 15:08

4

File f = new File("/Path/To/File/or/Directory");
if (f.exists() && f.isDirectory()) {
   ...
}else{
   throw new IllegalArgumentException();
}

edited Apr 24 '15 at 15:08

Chetan Kinger

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answered Apr 24 '15 at 14:59

igon

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score 0 · Answer 2 · answered Apr 24 '15 at 15:15

0

new File(path).isDirectory();

This will return true if the File is a Directory.

File dir = new File(userHome + "//data");
if(dir.isDirectory()){
   //store files in an array of File
   fileArray = dir.listFiles();
}
else 
 //do whatever you want

answered Apr 24 '15 at 15:15

Nicolas El Khoury

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In Java, how do I check if something is a directory, and if not, throw an exception?

2 Answers2