CODEWITHSUNDEEP
javasplitbufferedreaderfilereader
Dany123
Dany123

Reputation: 29

Split string in Txt files

Lets assume I have a txt file called "Keys.txt":

Keys.txt:
Test 1
Test1 2
Test3 3

I want to split the strings into an array and I dont know how to do it I want that the result will be in array like this:

Test
1
Test1
2
Test2
3

I have this started code:

FileReader fr = new FileReader("Keys.txt");
    BufferedReader br = new BufferedReader(fr);
    String str = br.readLine();
    br.close();
    System.out.println(str);

Upvotes: 0

Views: 2527

Answers (5)

Tridev Chaudhary
Tridev Chaudhary

Reputation: 368

    FileReader fr;
    String temp = null;
    List<String> wordsList = new ArrayList<>();
    try {
        fr = new FileReader("D://Keys.txt");

        BufferedReader br = new BufferedReader(fr);
        while ((temp = br.readLine()) != null) {
            String[] words = temp.split("\\s+");
            for (int i = 0; i < words.length; i++) {
                wordsList.add(words[i]);
                System.out.println(words[i]);
            }
        }
        String[] words = wordsList.toArray(new String[wordsList.size()]);
        br.close();

    } catch (Exception e) {
        e.printStackTrace();
    }

try this out

Upvotes: 0

davidxxx
davidxxx

Reputation: 131346

You can follow these steps :

  • read the current line in a String, then split the String on the whitespace (one or more) and you have an array which you can store elements in a List.
  • repeat the operation for each line.
  • convert the List to an array(List.toArray()).

For example :

List<String> list = new ArrayList<>();
try (BufferedReader br = new BufferedReader(new FileReader("Keys.txt"))) {

    String str;
    while ((str = br.readLine()) != null) {
        String[] token = str.split("\\s+");
        list.add(token[0]);
        list.add(token[1]);
    }

}
String[] array = list.toArray(new String[list.size()]);

Note that by using Java 8 streams and the java.nio API (available from Java 7) you could be more concise :

String[] array = Files.lines(Paths.get("Keys.txt"))
                      .flatMap(s -> Arrays.stream(s.split("\\s+"))
                                          .collect(Collectors.toList())
                                          .stream())
                      .toArray(s -> new String[s]);

Upvotes: 2

Gudra
Gudra

Reputation: 70

You could store all the lines on a single string, separated by spaces, and then split it into your desired array.

FileReader fr = new FileReader("Keys.txt");
BufferedReader br = new BufferedReader(fr);
String str="", l="";
while((l=br.readLine())!=null) { //read lines until EOF
    str += " " + l;
}
br.close();
System.out.println(str); // str would be like " Text 1 Text 2 Text 3"
String[] array = str.trim().split(" "); //splits by whitespace, omiting 
// the first one (trimming it) to not have an empty string member

Upvotes: 2

Przemysław Moskal
Przemysław Moskal

Reputation: 3609

You can use String.split() method (in your case it's str.split("\\s+");).

It will split input string on one or more whitespace characters. As Java API documentation states here:

\s - A whitespace character: [ \t\n\x0B\f\r]

X+ - X, one or more times.

Upvotes: 1

Alexander Petrov
Alexander Petrov

Reputation: 35

String str = "Test 1 Test1 2 Test2 3";
String[] splited = str.split("\\s+");

Upvotes: 1

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