Java String.split() on numeric strings

Question

I have a '|' delimited csv file with 2 columns:

A    |B
87657|5
87688|8
32134|4
...

I want to make a Map by reading this file, taking the column A values as string, and column B values as int.

I do (with delimiter = "|"):

    Map<String, Integer> output = new HashMap<>();
    assert delimiter.length() == 1;
    int count = 0;
    for(String line: Files.readAllLines(Paths.get(docidFreq), Charset.defaultCharset())) {
        count++;
        //skipping header row
        if (count == 1 ) {
            continue;
        }
        String tokens[] = line.split(delimiter);
        output.put(tokens[0], Integer.parseInt(tokens[1]));
    }
    return output;

However, the map contains single digit keys and values like (No relation to the sample file lines given above):

1:2
8:5
9:3
...

What am I doing wrong?

You should show us what delimiteris..

user180100
– user180100

2015-01-09 10:35:35 +00:00
Commented Jan 9, 2015 at 10:35 — user180100
– user180100, Commented Jan 9, 2015 at 10:35
@RC Sorry, edited. The delimiter is the string "|".

PhoenixPerson
– PhoenixPerson

2015-01-09 10:43:16 +00:00
Commented Jan 9, 2015 at 10:43 — PhoenixPerson
– PhoenixPerson, Commented Jan 9, 2015 at 10:43

wassgren · Accepted Answer · 2015-01-09 10:41:06Z

9

When you use the symbol '|' you have to escape it with two '\' like below in split.

split("\\|");

edited Jan 9, 2015 at 10:41

wassgren

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answered Jan 9, 2015 at 10:39

robin

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Comments

SMA · Accepted Answer · 2015-01-09 10:45:22Z

0

Try something like:

String line = "87657|5";//line from a file
Map<String, Integer> map = new HashMap<String, Integer>();
String[] numbers = line.split("\\|");//assuming you have entries in file like "num1|num2"
map.put(numbers[0], Integer.parseInt(numbers[1]));
System.out.print(map);

Output:
{87657=5}

answered Jan 9, 2015 at 10:45

SMA

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Comments

peterremec · Accepted Answer · 2015-01-09 10:46:33Z

0

You can do something like:

StringTokenizer st = new StringTokenizer (line, "\\|");
map.put(st.nextToken(), Integer.parseInt(st.nextToken()));

edited Jan 9, 2015 at 10:46

answered Jan 9, 2015 at 10:41

peterremec

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Comments

Mihai Iorga · Accepted Answer · 2015-01-09 11:27:33Z

0

You can use either any of following ways:

String[] str = line.split("\ \|");

or

StringTokenizer st = new StringTokenizer (line, "\ \|");

split() quite easy to use whereas StringTokenizer much faster than String.split() method.

edited Jan 9, 2015 at 11:27

Mihai Iorga

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answered Jan 9, 2015 at 11:18

Manoja Brahma

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