how to replace a char in a specific index with another char on another index

Question

The following code prints eleelde but I want it to print elcaalde.

How can I do it? Is there a function like replace char at index()??

I want to assign the character at i=0 the value of the char at i=6 and print the word elcaalde.

public class ReverseExperiments3 {  
   public static void main (String[] args) {
      String s= "alcaalde";
      s=s.replace('a','e'); 
      System.out.println(s);
   }
}

score 2 · Answer 1 · answered Feb 08 '18 at 09:27

2

Change it in the char array:

char[] cs = s.toCharArray();
cs[0] = cs[6];  // For example.
s = new String(cs);

answered Feb 08 '18 at 09:27

Andy Turner

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in order to achieve the result, it is 7th element and so s[7]. Anyways, you were right giving it as s[6] as he asked for it – Jayanth Feb 08 '18 at 09:32

Tim Biegeleisen · Answer 2 · 2018-02-08T11:34:00.740

0

You could also use a regex replacement here:

String s = "alcaalde";
s = s.replaceFirst("(.)(.{6})(.)", "$3$2$1");

Demo

The answer given by @andy is probably the best one for this exact problem. But if the OP needed to move around strings, then a regex based approach would put us in a fairly good position.

edited Feb 08 '18 at 11:34

answered Feb 08 '18 at 09:29

Tim Biegeleisen

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Why `replaceAll`, not `replaceFirst` ? – khelwood Feb 08 '18 at 09:30
@khelwood In this particular case, since the pattern covers the entire string, I would expect `replaceFirst` and `replaceAll` to basically do the same thing. – Tim Biegeleisen Feb 08 '18 at 11:32

score 0 · Answer 3 · answered Feb 08 '18 at 09:30

0

try this code: If you wanna get what you want, it is 7th element

String s= "alcaalde";
char[] cs = s.toCharArray();
cs[0] = cs[7];  
s = new String(cs);

answered Feb 08 '18 at 09:30

Jayanth

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how to replace a char in a specific index with another char on another index

3 Answers3

Demo