Java reading a file into an ArrayList?

Question

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

Here are the file contents:

cat
ho         


        

Answer 1

Add this code to sort the data in text file. Collections.sort(list);

Answer 2

Simplest form I ever found is...

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

Answer 3

    Scanner scr = new Scanner(new File(filePathInString));
/*Above line for scanning data from file*/

    enter code here

ArrayList<DataType> list = new ArrayList<DateType>();
/*this is a object of arraylist which in data will store after scan*/

while (scr.hasNext()){

list.add(scr.next()); } /*above code is responsible for adding data in arraylist with the help of add function */

Answer 4

A one-liner with commons-io:

List<String> lines = FileUtils.readLines(new File("/path/to/file.txt"), "utf-8");

The same with guava:

List<String> lines = 
     Files.readLines(new File("/path/to/file.txt"), Charset.forName("utf-8"));

Answer 5

List<String> words = new ArrayList<String>();
BufferedReader reader = new BufferedReader(new FileReader("words.txt"));
String line;
while ((line = reader.readLine()) != null) {
    words.add(line);
}
reader.close();

Answer 6

Here's a solution that has worked pretty well for me:

List<String> lines = Arrays.asList(
    new Scanner(new File(file)).useDelimiter("\\Z").next().split("\\r?\\n")
);

If you don't want empty lines, you can also do:

List<String> lines = Arrays.asList(
    new Scanner(new File(file)).useDelimiter("\\Z").next().split("[\\r\\n]+")
);