CODEWITHSUNDEEP
javaarraylisttext-files
momo
momo

Reputation: 25

Transferring each elemnt in a text file into an array

I have made this method to take in a file.txt and transfer its elements into an array list. My problem is, I dont want to transfer a whole line into one string. I want to take each element on the line as string. 

   public ArrayList<String> readData() throws IOException  {
     FileReader pp=new FileReader(filename);
     BufferedReader nn=new BufferedReader(pp);
     ArrayList<String> data=new ArrayList<String>();
     String line;

     while((line=nn.readLine()) != null){
        data.add(line);
      }
     xoxo.close();
     return data;

    }

is it possible ?

Upvotes: 1

Views: 1133

Answers (3)

Tom&#225;š Gašpar
Tom&#225;š Gašpar

Reputation: 29

Use split function for String.

String line = "This is line";
String [] a = line.split("\\s");// \\s is regular expression for space

a[0] = This
a[1] = is
a[2] = line

Upvotes: 2

GameDroids
GameDroids

Reputation: 5662

What about reading the lines, but splitting each line into the single words? 

while ((line = nn.readLine()) != null) {
    for (String word : line.split(" ")) {
        data.add(line);
    }
}

The method split(" ") in this example will split the line on each whitespace " " and put the single words into an array.

In case the words in the file are separated by another character (like a comma for example) you can use that too in split():

line.split(",");

If I may, here is a somewhat easier way to read a text file:

Scanner scanner = new Scanner(filename);
while (scanner.hasNextLine()) {
    String line = scanner.nextLine();
    for (String word : line.split(" ")) {
        data.add(word);
    }
}

Well not easier but shorter :)

And one last advice: if you give your variables a more.. readable name like bufferedReader instead of naming them all nn, pp, xoxo you might have less problems when the code grows more and more complex later on

Upvotes: 2

Harrison South
Harrison South

Reputation: 1

If by 'Element' you mean each word, then simply changing 

line = nn.readLine()

to 

line = nn.read()

should fix your problem, as the read method will take in every character it reads until it hits a space character in which it will return the processed characters. However if by element you mean each character then the problem is much harder. You will need to read each word and split that string up using any of the various functions Java provides.

Upvotes: 0

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