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
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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); }