While reading a file in java how to detect we have a line?

Question

I am reading a file Java, using this code :

File file = new File(--path-);

Scanner reader= new Scanner(file);

while(reader.hasNext()){

    // i want to add here if reader.Next() == emptyline
    // I tried if reader.Next()=="" but it did not work.

}

thank you all

Answer 1

next() reads words and skips blanks.

I suggest you use

while(reader.hasNextLine()) {
    String line = reader.nextLine();
    if(line.isEmpty()) { ...

Answer 2

try looking at http://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#nextLine()

String line = reader.nextLine ();
while (line != null) {

  if (line.length () == 0) {
     System.out.println ("zero length line");
  }
  else {
    System.out.println (line);
  }
  line = reader.nextLine ();
}

or

while (reader.hasNextLine()) {

  line = reader.nextLine ();
  if (line.length () == 0) {
     System.out.println ("zero length line");
  }
  else {
    System.out.println (line);
  }

}

Answer 3

If you just need to read all the lines, you can simply use:

List<String> lines = Files.readAllLines(path, charset);