CODEWITHSUNDEEP
javastringspace
Babu R
Babu R

Reputation: 1035

Adding space between characters

I want to add space after every two chars in a string.

For example:

javastring

I want to turn this into:

ja va st ri ng

How can I achieve this?

Upvotes: 9

Views: 38916

Answers (3)

Nitin Divate
Nitin Divate

Reputation: 67

//Where n = no of character after you want space

int n =2;
StringBuilder str = new StringBuilder("ABCDEFGHIJKLMNOP");
int idx = str.length() - n;
while (idx > 0){
   str.insert(idx, " ");
   idx = idx - n;
}
return str.toString();

Explanation, this code will add space from right to left:

str = "ABCDEFGH" int idx = total length - 2; //8-2=6
while (8>0)
{
    str.insert(idx, " "); //this will insert space at 6th position
    idx = idx - n; // then decrement 6-2=4 and run loop again
}

The final output will be 

AB CD EF GH

Upvotes: 5

Arif Nadeem
Arif Nadeem

Reputation: 8604

I wrote a generic solution for this...

public static String insertCharacterForEveryNDistance(int distance, String original, char c){
    StringBuilder sb = new StringBuilder();
    char[] charArrayOfOriginal = original.toCharArray();
    for(int ch = 0 ; ch < charArrayOfOriginal.length ; ch++){
        if(ch % distance == 0)
            sb.append(c).append(charArrayOfOriginal[ch]);
        else
            sb.append(charArrayOfOriginal[ch]);
    }
    return sb.toString();
}

Then call it like this...

String result = InsertSpaces.insertCharacterForEveryNDistance(2, "javastring", ' ');
System.out.println(result);

Upvotes: 1

Mark Byers
Mark Byers

Reputation: 839234

You can use the regular expression '..' to match each two characters and replace it with "$0 " to add the space:

s = s.replaceAll("..", "$0 ");

You may also want to trim the result to remove the extra space at the end.

See it working online: ideone.

Alternatively you can add a negative lookahead assertion to avoid adding the space at the end of the string:

s = s.replaceAll("..(?!$)", "$0 ");

Upvotes: 49

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