Java - parse lines

Question

What is the best practice for parsing these lines from a file?

files       txt 50     // first gab are spaces, the second is tabulator
files       bmp 9979
files       all 2063
score       scr 656
index       ind 0.0779
index       ind 0.0213

I need to get just values (50, 9979, etc.) to be able to save them to CSV file (but this is not part of this question).

sp00m · Accepted Answer · 2013-04-02 08:38:25Z

5

You could split by \s+ and accessing the last cell of the returned array.

for (String line : lines) {
    String[] data = line.split("\\s+");
    String lastEntry = data[data.length - 1];
    // lastEntry contains what you're looking for
}

answered Apr 2, 2013 at 8:38

sp00m

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user2032663 · Accepted Answer · 2013-04-02 08:40:42Z

5

Is this what you want?

BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
   String val = line.split("\\s+")[2];
   //do something with val

}
br.close();

answered Apr 2, 2013 at 8:40

user2032663

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Damian Leszczyński - Vash · Accepted Answer · 2013-04-02 08:38:17Z

2

This look like typical flat file. To read the number you should just move cursor for each line at the point of interest and read all character you need.

For your case you should start from 16 and read to the end of line.

1234567890123456
files       txt 50     
files       bmp 9979
files       all 2063
score       scr 656
index       ind 0.0779
index       ind 0.0213

answered Apr 2, 2013 at 8:38

Damian Leszczyński - Vash

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1 Comment

Damian Leszczyński - Vash Over a year ago

The op wrote about the structure. First are spaces then a tab.

Kevin Bowersox · Accepted Answer · 2013-04-02 08:38:20Z

2

Read each line using a FileReader then split the String by whitespace and retrieve the third index.

String value =line.split("\\s+")[2];

answered Apr 2, 2013 at 8:38

Kevin Bowersox

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Sudhanshu Umalkar · Accepted Answer · 2013-04-02 08:37:38Z

1

Read lines, iterate through them and use regex to split lines and get the values. That's it.

answered Apr 2, 2013 at 8:37

Sudhanshu Umalkar

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