Question

My situation is simple.
I have this in my program:

File folder = new File("input");
File[] listOfFiles = folder.listFiles();
System.out.println(listOfFiles.length);

I just want to put all the path of files from the folder “input” to an array.
It works fine by running with eclipse.When I try to do this in cmd, it gives me an null pointer exception. My java file is in this directory:

C:\Users\JHeng\Desktop\java stuff\converter\src

Thanks for responding!

If I put the absolute directory in the first line:

File folder = new File("C:\\Users\\JHeng\\Desktop\\java stuff\\converter\\src\\input");

When I run it in eclipse, eclipse even gives me a null pointer exception in the line

System.out.println(listOfFiles.length);

Thanks in advance!

Answer 1

It obviously a problem of workspace. Now try the below code…….

But first be sure you have “src” folder on the specified path…, which is passed in File constructor as an argument below.

File folder = new File("c:\\Users\\JHeng\\Desktop\\java stuff\\converter\\src");
File[] listOfFiles = folder.listFiles();
System.out.println(listOfFiles.length);