How to insert Space after every Character of an existing String in Java?

Question

I need to insert a space after every character of a string.

i.e. String name = \"Joe\";

should become: \"J o e\"

Answer 1

Shorter would be using a regex:

System.out.println("Joe".replaceAll(".(?!$)", "$0 "));

Answer 2

For Android & Kotlin users, if you want to add space after every X characters then use this

val stringWithSpaceAfterEvery4Chars = stringWith16Chars?.replace("....".toRegex(), "$0 ")

Here I added 4 dots in method to add space after every 4th character in my whole string. If you want space after every 2 characters then add only 2 dots in the method.

My variables:

stringWith16Chars = "123456789012"

and the output would be,

stringWithSpaceAfterEvery4Chars = "1234 5678 9012"

Answer 3

Something like:

String joe = "Joe";
StringBuilder sb = new StringBuilder();

for (char c: joe.toCharArray()) {
   sb.append(c).append(" ");
}

System.out.println(sb.toString().trim());

Answer 4

Using kotlin

val textToBeDevided = "123456789" 
textToBeDevided
   .subSequence(1, textToBeDevided.length) 
   .chunked(3) // group every 3 chars
   .joinToString(" ") // merge them applying space

Answer 5

You can convert Joe to char[] by using String's toCharArray() then traverse char[] to grab the char into another char[] and as you add the char to the second char[], you add a space character '" "'. Set a if-else within the loop to detect the last character so that you wouldn't add a space character by accident behind the last character. Use a String to valueOf() the resulting char[] to turn it into a String object.

Answer 6

Removing the final space:

String joe = "Joe"; 
StringBuilder sb = new StringBuilder(); 
String sep = "";
for (char c: joe.toCharArray()) { 
    sb.append(sep).append(c);
    sep = " ";
} 

System.out.println(sb.toString());