Store text file content line by line into array

Question

all,I\'m now facing the problem of no idea on storing the content in text file into the array. The situation is like, text file content:

abc1
xyz2
rxy3


        

Answer 1

You need to do something like this for your case:-

int i = 0;
while((str = in.readLine()) != null){
    arr[i] = str;
    i++;
}

But note that the arr should be declared properly, according to the number of entries in your file.

Suggestion:- Use a List instead(Look at @Kevin Bowersox post for that)

Answer 2

The simplest solution:

List<String> list = Files.readAllLines(Paths.get("path/of/text"), StandardCharsets.UTF_8);
String[] a = list.toArray(new String[list.size()]); 

Note that java.nio.file.Files is since 1.7

Answer 3

I would recommend using an ArrayList, which handles dynamic sizing, whereas an array will require a defined size up front, which you may not know. You can always turn the list back into an array.

BufferedReader in = new BufferedReader(new FileReader("path/of/text"));
String str;

List<String> list = new ArrayList<String>();
while((str = in.readLine()) != null){
    list.add(str);
}

String[] stringArr = list.toArray(new String[0]);

Answer 4

JAVA 8 :

Files.lines(new File("/home/abdennour/path/to/file.txt").toPath()).collect(Collectors.toList());

Answer 5

Just use Apache Commons IO

List<String> lines = IOUtils.readLines(new FileInputStream("path/of/text"));

Answer 6

This should work because it uses List as you don't know how many lines will be there in the file and also they may change later.

BufferedReader in = new BufferedReader(new FileReader("path/of/text"));
String str=null;
ArrayList<String> lines = new ArrayList<String>();
while((str = in.readLine()) != null){
    lines.add(str);
}
String[] linesArray = lines.toArray(new String[lines.size()]);