How to replace character inside string in java

Question

I have a string similar to the one below:

String abc = "122222";

and I want to be able to replace a specified character inside string, so the '1' becomes '2' in the example above.

`"122222".replace("1","2");` – Lefteris E May 15 '13 at 07:51 — Lefteris E, May 15 '13 at 07:51

score 4 · Answer 1 · edited May 15 '13 at 07:50

4

Simply do:

abc = abc.replace('1', '2');

edited May 15 '13 at 07:50

Michal Borek

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answered May 15 '13 at 07:49

javic

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score 4 · Answer 2 · answered May 15 '13 at 07:49

4

String abc = "122222";
abc = abc.replace('1','2');

answered May 15 '13 at 07:49

Marco Forberg

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It's Java, so you need to use double quotes. – Marcos May 15 '13 at 07:52
@enrmarc no. there are two replace methods. – Marco Forberg May 15 '13 at 07:53
even single quote is fine – AllTooSir May 15 '13 at 07:53
@MarcoForberg you are right. I learned something new today. – Marcos May 15 '13 at 07:56

score 3 · Answer 3 · answered May 15 '13 at 07:49

3

Use the replace() method of String

String abc = "122222";
abc = abc.replace("1", "2");

answered May 15 '13 at 07:49

AllTooSir

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Marcos · Answer 4 · 2013-05-15T07:57:41.097

3

You should use replaceFirst if you want to replace only the first 1

String abc = "122222";
abc = abc.replaceFirst("1","2");

because replace will replace all occurrences of 1 in abc.

edited May 15 '13 at 07:57

answered May 15 '13 at 07:50

Marcos

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score 1 · Answer 5 · answered May 15 '13 at 07:51

1

A quick search for the java string API would have given you what you needed. With examples too.

answered May 15 '13 at 07:51

Dark Star1

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2

This should rather be a comment than an answer – Marco Forberg May 15 '13 at 07:52
Teaching the man to fish – Dark Star1 May 15 '13 at 07:53

score 0 · Answer 6 · answered May 15 '13 at 08:09

0

Here i am replacing "2" with "3" test this.

public class TextDemo {
public static void main(String arg[]) {
    String a = "11112bbbb";
    int b = a.indexOf("2");
    String c = a.substring(0, b);
    String d = a.substring(b);
    String e = d.substring(1);
    String f = "3" + e;
    String finalString = c + f;

    System.out.println(finalString);

}

answered May 15 '13 at 08:09

KhAn SaAb

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a bit complicated and you forgot to check whether `indexOf()` returned -1 – Marco Forberg May 15 '13 at 08:26
@Macro Forberg I have given basic idea , need some validation check..:) – KhAn SaAb May 15 '13 at 08:28

How to replace character inside string in java

6 Answers6