javajava-5

Java reading a file into an ArrayList?

How do you read the contents of a file into an ArrayList<String> in Java?

Here are the file contents:

cat
house
dog
.
.
.
Solution

  • This Java code reads in each word and puts it into the ArrayList:

    Scanner s = new Scanner(new File("filepath"));
ArrayList<String> list = new ArrayList<String>();
while (s.hasNext()){
    list.add(s.next());
}
s.close();

    Use s.hasNextLine() and s.nextLine() if you want to read in line by line instead of word by word.