Program throws NullPointerException when i try to search in drives?

Question

I wrote a program to find file or directory.
Its working properly when i am trying to Search file with in Directory
example
java FileSea

Answer 1

list()

The documentation of listFiles() mentions that it will return null if this abstract pathname does not denote a directory, or if an I/O error occurs. Additionally, you would need to check with file.canRead() whether the application can read the directory.

IMHO

Always use it this way;

String[] files = file.list();
if (files!=null) {
    for (String f : files) processFile(f);
}

Recommend this;

File directory = new File(directoryName);

//get all the files from a directory
File[] fList = directory.listFiles();

if(fList != null){
    for (File file : fList){
        if (file.isFile()){
            System.out.println(file.getName());
        }
    }
}

Do let me know if you have any questions.