Read comma separated text file within Java

Question

My text file is like:

1, gold, silver, truck
2, gold, fire, truck
3, china, asia, gold, silver, truck, truck
4, ireland, spain, prague, paris

How to jump the first element of the line (1,2,3,4) and read rest of the word one by one?

And how to read only the first element of a row?

Cause I need to store them separatly into two HashMaps.

Thx

`split()` method on the string object. Also use the `BufferedFileReader` class' `readLine()` method — Dan Temple, Mar 12 '14 at 13:17
Come on!! it's not very hard. The time your've spent writing your question would have been the time to figure out the answer yourself by googling. — TheEwook, Mar 12 '14 at 13:20
really you didn't make any google search? I think it's trivial! — Stathis Andronikos, Mar 12 '14 at 13:20
Try searching for your exact title: https://www.google.com/search?q=Read+comma+separated+text+file+within+Java — aliteralmind, Mar 12 '14 at 13:21
Possible duplicate of [How can I read comma separated values from a text file in Java?](https://stackoverflow.com/questions/10960213/how-can-i-read-comma-separated-values-from-a-text-file-in-java) — Paul Rooney, Oct 28 '19 at 22:46

score 1 · Answer 1 · answered Mar 12 '14 at 13:17

1

You read the file line by line and split each line at the commas. This gives you a String[]. The first Element in that Array is the number, the others are the words.

answered Mar 12 '14 at 13:17

quantumbyte

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Salah · Answer 2 · 2014-03-12T13:33:30.643

0

I think that You need to read the file line by line, so try this:

BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
   // do stuff
}
br.close();

and if you want to skip the first element add this code before the while loop.

br.readLine();//to skip the first line

edited Mar 12 '14 at 13:33

answered Mar 12 '14 at 13:16

Salah

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How will the second code snippet help skipping the first element? – quantumbyte Mar 12 '14 at 13:22

score 0 · Answer 3 · answered Mar 12 '14 at 13:21

0

you can read file line by line and use string tokenizer: StringTokenizer st = new StringTokenizer(String readline, String ","); Check this

answered Mar 12 '14 at 13:21

StackExploded

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score 0 · Answer 4 · answered Mar 12 '14 at 13:30

You can read separate the tokens with comma and read token by token:

Scanner sc = new Scanner(new File("myfile.txt"));
sc.useDelimiter(",|$");

int lineNumber = 1;
String lineNumberStr = String.valueof(lineNumber);

while (sc.hasNext()) {

    String token = sc.next();

    if (toekn.equals(lineNumberStr)) {
        ++lineNumber;
        lineNumberStr = String.valueof(lineNumber);
        continue;
    } // if

    putWordIntoMyHashMap(token);
} // while

score -1 · Answer 5 · answered Mar 12 '14 at 13:16

-1

Have you looked at commons-csv? http://commons.apache.org/proper/commons-csv/

answered Mar 12 '14 at 13:16

Ray

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I think the simple task the OP wants to implement can be easily done without a library. I feel like that would be overkill. – quantumbyte Mar 12 '14 at 13:21

Read comma separated text file within Java

5 Answers5