How do I replace character from string at specific indexes

Question

I need to replace character from string at specific index.

This is how I am trying to do it:

String myName = "domanokz";
myName.charAt(4) = 'x';

This gives an error. Is there any method to do this?

Answer 1

String are immutable in Java. You can't change them.

You need to create a new string with the character replaced.

String myName = "domanokz";
String newName = myName.substring(0,4)+'x'+myName.substring(5);

Or you can use a StringBuilder:

StringBuilder myName = new StringBuilder("domanokz");
myName.setCharAt(4, 'x');

System.out.println(myName);

Answer 2

You could turn the String into a char[], replace the letter by index, then convert the array back into a String.

String myName = "domanokz";
char[] myNameChars = myName.toCharArray();
myNameChars[4] = 'x';
myName = String.valueOf(myNameChars);

Hope this helps!