Java: How to split a string by a number of characters?

Question

I tried to search online to solve this question but I didn\'t found anything.

I wrote the following abstract code to explain what I\'m asking:

String         


        

Answer 1

I don't think there's an out-of-the-box solution, but I'd do something like this:

private String[] splitByNumber(String s, int chunkSize){
    int chunkCount = (s.length() / chunkSize) + (s.length() % chunkSize == 0 ? 0 : 1);
    String[] returnVal = new String[chunkCount];
    for(int i=0;i<chunkCount;i++){
        returnVal[i] = s.substring(i*chunkSize, Math.min((i+1)*chunkSize-1, s.length());
    }
    return returnVal;
}

Usage would be:

String[] textArray = splitByNumber(text, 4);

EDIT: the substring actually shouldn't surpass the string length.

Answer 2

This is the simplest solution i could think off.. try this

public static String[] splitString(String str) {
    if(str == null) return null;

    List<String> list = new ArrayList<String>();
    for(int i=0;i < str.length();i=i+4){
        int endindex = Math.min(i+4,str.length());
        list.add(str.substring(i, endindex));
    }
  return list.toArray(new String[list.size()]);
}

Answer 3

What about a regexp?

public static String[] splitByNumber(String str, int size) {
    return (size<1 || str==null) ? null : str.split("(?<=\\G.{"+size+"})");
}

See Split string to equal length substrings in Java

Answer 4

Try this

 String text = "how are you?";
    String array[] = text.split(" ");

Or you can use it below

List<String> list= new ArrayList<String>();
int index = 0;
while (index<text.length()) {
    list.add(text.substring(index, Math.min(index+4,text.length()));
    index=index+4;
}

Answer 5

Using Guava:

Iterable<String> result = Splitter.fixedLength(4).split("how are you?");
String[] parts = Iterables.toArray(result, String.class);

Answer 6

My application uses text to speech! Here is my algorithm, to split by "dot" and conconate string if string length less then limit

String[] text = sentence.split("\\.");
 ArrayList<String> realText =  sentenceSplitterWithCount(text);

Function sentenceSplitterWithCount: (I concanate string lf less than 100 chars lenght, It depends on you)

private ArrayList<String> sentenceSplitterWithCount(String[] splittedWithDot){

        ArrayList<String> newArticleArray = new ArrayList<>();
        String item = "";
        for(String sentence : splittedWithDot){

            item += DataManager.setFirstCharCapitalize(sentence)+".";

            if(item.length() > 100){
                newArticleArray.add(item);
                item = "";
            }

        }

        for (String a : newArticleArray){
            Log.d("tts", a);

        }

        return newArticleArray;
    }

function setFirstCharCapitalize just capitalize First letter: I think, you dont need it, anyway

   public static String setFirstCharCapitalize(String input) {


        if(input.length()>2) {
            String k = checkStringStartWithSpace(input);
            input = k.substring(0, 1).toUpperCase() + k.substring(1).toLowerCase();
        }

        return input;
    }