How do I put a file with full names into an arraylist in java?

Question

I have a file in the project in netbeans called "input.txt" which has a list of names like the following:

John Doe
Magnus Carlsen
Mikhail Tal
Bobby Fischer

I created an arraylist with:

ArrayList <String> names = new ArrayList<String>();

I want to add in the arraylist names. I want the value at [0] to be "John Doe" and the value at [1] to be "Magnus Carlsen" and so on. How can I do this?

you might want to read this: http://stackoverflow.com/questions/2788080/reading-a-text-file-in-java ; and the rest is just `names.add(..)` — Yohanes Khosiawan 许先汉, Mar 27 '14 at 00:45
possible duplicate of [How to create a Java String from the contents of a file?](http://stackoverflow.com/questions/326390/how-to-create-a-java-string-from-the-contents-of-a-file) — aliteralmind, Mar 27 '14 at 00:46

Matthew Madson · Answer 1 · 2018-12-28T22:51:11.600

1

Java 8

List<String> names = Files.readAllLines(Paths.get("/path/to/names/file.txt"));

javadoc

Java 7

List<String> names = Files.readAllLines(Paths.get("C:/path/To/Your/File.txt"), Charset.defaultCharset());

javadoc

edited Dec 28 '18 at 22:51

answered Mar 27 '14 at 00:45

Matthew Madson

1,643
13
24

Thanks, wasn't aware links were discouraged – Matthew Madson Mar 27 '14 at 00:50
3

Links aren't discouraged. *Link-only answers* are discouraged. Put the link there, but elaborate on it in the context of the question. – aliteralmind Mar 27 '14 at 00:51

score 1 · Answer 2 · answered Mar 27 '14 at 00:47

This is somehow trivial:

List<String> names = new ArrayList<>();

try(BufferedReader reader = new BufferedReader(new FileReader("myFile.txt"))) {
    String line;
    while((line = reader.readLine()) != null) {
        names.add(line);
    }
} catch (IOException e) {
    e.printStackTrace();
}

System.out.println("My list: " + names);

Josh Roberts · Answer 3 · 2014-03-27T06:41:18.137

0

You could do something like this:

Scanner s = new Scanner(new File("filePath"));
List<String> names = new ArrayList<String>();

while (s.hasNext()){
    names.add(s.nextLine());
}

s.close()

edited Mar 27 '14 at 06:41

answered Mar 27 '14 at 00:49

Josh Roberts

862
6
12

What does `next()` do? – Sotirios Delimanolis Mar 27 '14 at 00:53
[I don't think it does](http://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#next()). – Sotirios Delimanolis Mar 27 '14 at 01:16
@SotiriosDelimanolis it may need `.useDelimiter("\n")` but I'm pretty sure it does that by default. Haven't checked this yet but off the top of my head it seems ok – Josh Roberts Mar 27 '14 at 01:37
The default is whitespace. So a space between words will be considered the end of a token. This won't read a full line. Use `nextLine()` for that. – Sotirios Delimanolis Mar 27 '14 at 01:38
@SotiriosDelimanolis Ok, I'll take your word on that. Updated my answer, cheers – Josh Roberts Mar 27 '14 at 09:05
Don't forget to also switch hasNext for hasNextLine. Don't take my word for it, you should try it when you have a chance. – Sotirios Delimanolis Mar 27 '14 at 13:05

How do I put a file with full names into an arraylist in java?

3 Answers3

Java 8

Java 7