I have this code sample to Copy files and directories from one location to another. But this exception keep showing every time I run the program. Can anyone please help me find out the error?
Exception in thread "main" java.lang.NullPointerException
public void listFilesAndFilesSubDirectories(String directoryName) throws FileNotFoundException, IOException {
File directory = new File(directoryName);
//get all the files from a directory
File[] fList = directory.listFiles();
for (File file : fList) {
if (file.isFile()) {
//System.out.println(file.getAbsolutePath());
System.out.println("File");
File source = new File("C:\\Users\\Core i3\\Desktop\\Check me\\" + file);
File dest = new File("C:\\Users\\Core i3\\Desktop\\New folder");
System.out.println(source);
InputStream is = null;
OutputStream os = null;
try {
is = new FileInputStream(source);
os = new FileOutputStream(dest);
byte[] buffer = new byte[1024];
int length;
while ((length = is.read(buffer)) > 0) {
os.write(buffer, 0, length);
}
} finally {
is.close();
os.close();
}
} else if (file.isDirectory()) {
listFilesAndFilesSubDirectories(file.getAbsolutePath());
System.out.println("Directory");
File source = new File("C:\\Users\\Core i3\\Desktop\\Check me\\" + file);
File dest = new File("C:\\Users\\Core i3\\Desktop\\New folder");
InputStream is = null;
OutputStream os = null;
try {
is = new FileInputStream(source);
os = new FileOutputStream(dest);
byte[] buffer = new byte[1024];
int length;
while ((length = is.read(buffer)) > 0) {
os.write(buffer, 0, length);
}
} finally {
is.close();
os.close();
}
}
}
}
