Skip folder if it does not exists using java

I have created a property file in java named prop.properties inside eclipse.

In prop.properties file, I have added below lines:- users = user1,user2,user3

where user1 , user2 and user3 are folders.

I have created directory named TestDir which contains, user1,user3 folders

Suppose if user2 folder is not present in TestDir, I have to skip that and consider the other folder.

I have used the below code,

int fileCount = directory.list().length;
File[] logFiles = directory.listFiles();
            if (logFiles != null) {
                for (File f : logFiles) {
                System.out.println(f);
                }
}

But I am getting error. The error is,

Exception in thread "main" java.lang.NullPointerException: Cannot read the array length because the return value of "java.io.File.list()" is null

Can someone help with resolution

Answer

The problem is getting the count when the directory list is null will fail on the first line. Add a test that sets fileCount to zero in that case. Like,

File[] logFiles = directory.listFiles();
int fileCount = (logFiles == null) ? 0 : logFiles.length;
for (int i = 0; i < fileCount; i++) { // <-- this is safe
    File f = logFiles[i];
    System.out.println(f);
}