CODEWITHSUNDEEP
javaarraysstring
bjexe
bjexe

Reputation: 13

Using String arrays to tokenize letters of each entry

I'm trying to tokenize letters of a string array, versus the string type.

I used .split() for converting a string into an array that consisted of each word in the array, but I'm having trouble finding a similar method to tokenize letters in the array.

I tried looking online for a method or tool to use but I haven't had any luck with regard to string arrays. Maybe something similar to substring?

If someone could point me in the right direction it would be appreciated.

Here's what I have: 

// i variables run through rows and j variables run through each word in the string array. 
// tokens is the string array
for(int i = 0; i < tokens.length; i ++){
    for(int j = 0; j < tokens[i].length; j++)
    ...
}

Is there a method with regards to arrays to compute the length of each word within each row of the array?

Upvotes: 0

Views: 53

Answers (1)

azro
azro

Reputation: 54168

Consider size is the length you want for each part, you have to substring from a index to index+size and do this iterating over the string until you reach the end which will be given by the length of string minus the size

It's better to use a List rather than an array because it's easier to add elements, sure you can compute the number of split you'll get, but that's another way

Version using IntStream and Streams :

String str = new Scanner(System.in).nextLine();
int size = 2;
List<String> res = IntStream.range(0, str.length() - size + 1)
                            .mapToObj(i -> str.substring(i, i + size))
                            .collect(Collectors.toList());
System.out.println(res); // [he, el, ll, lo]

Version using basic for-loop :

String str = new Scanner(System.in).nextLine();
int size = 3;
List<String> res = new ArrayList<>();
for (int i = 0; i < str.length() - size + 1; i++) {
    res.add(str.substring(i, i + size));
}
System.out.println(res); // [hel, ell, llo]

Upvotes: 2

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