Replacing last character in a String with java

Question

I have a string:

String fieldName = "A=2,B=3 and C=3,";

Now I want to replace last , with space.

I have used:

if (fieldName.endsWith(",")) {
    fieldName.replace(",", " ");
    fieldName = fieldName.replace((char) (fieldName.length() - 1), 'r');
}

System.out.println("fieldName = " + fieldName);

But still I am getting the same old string. How I can get this output instead?

fieldName = A=2,B=3 and C=3

Abubakkar · Accepted Answer · 2015-12-09 13:47:06Z

75

You can simply use substring:

if(fieldName.endsWith(","))
{
  fieldName = fieldName.substring(0,fieldName.length() - 1);
}

Make sure to reassign your field after performing substring as Strings are immutable in java

edited Dec 9, 2015 at 13:47

answered Mar 7, 2013 at 10:21

Abubakkar

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4 Comments

dani herrera Over a year ago

notice in javascript length() is length with out brackets

weston Over a year ago

@danihp and in c# it's .Length...but then I'd expect a completely unrelated language to have different code javascriptisnotjava.io

dani herrera Over a year ago

@weston, sure!! Let explain my self. I found and applied Abubakkar Rangara's solution searching about javascript issue. Because this, I wrote comment (and also I vote it up), to other users than found this answer looking for a jscript snipped. Snipped runs on both, java and javascript just with the little change. Finally, a quote from Big Data Borat just for laugh: twitter.com/bigdataborat/status/356928145041002498

weston Over a year ago

@danihp That's a good one, I added to that site. Congrats to you too!

NPE · Accepted Answer · 2013-03-07 10:20:47Z

17

i want to replace last ',' with space

if (fieldName.endsWith(",")) {
    fieldName = fieldName.substring(0, fieldName.length() - 1) + " ";
}

If you want to remove the trailing comma, simply get rid of the + " ".

answered Mar 7, 2013 at 10:20

NPE

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Comments

Ripon Al Wasim · Accepted Answer · 2018-03-20 12:38:55Z

13

To get the required result you can do following:

fieldName = fieldName.trim();
fieldName = fieldName.substring(0,fieldName.length() - 1);

edited Mar 20, 2018 at 12:38

Ripon Al Wasim

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answered Mar 7, 2013 at 10:20

Azodious

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1 Comment

Tarit Ray Over a year ago

It will work but in case null value in string it will run time error, better to check if not null value then should execute the code !!!

Matt Cain · Accepted Answer · 2013-03-07 10:20:04Z

11

fieldName = fieldName.substring(0, string.length()-1) + " ";

answered Mar 7, 2013 at 10:20

Matt Cain

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Comments

vefthym · Accepted Answer · 2018-11-08 18:11:31Z

10

Firstly Strings are immutable in java, you have to assign the result of the replace to a variable.

fieldName = fieldName.replace("watever","");

You can use also use regex as an option using String#replaceAll(regex, str);

fieldName = fieldName.replaceAll(",$","");

edited Nov 8, 2018 at 18:11

vefthym

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answered Mar 7, 2013 at 10:20

PermGenError

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1 Comment

mah454 Over a year ago

second solution is good for stream pipe ...

panticz · Accepted Answer · 2015-04-21 08:27:39Z

7

Try this:

s = s.replaceAll("[,]$", "");

answered Apr 21, 2015 at 8:27

panticz

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2 Comments

Tarit Ray Over a year ago

I guess this will replace all ","

Iain Over a year ago

@TaritRay It won't, because the dollar sign in the regular expression represents the end of the string. So s = s.replaceAll("[,]", ""); would remove all commas, while panticz.de's example will only replace a comma at the end of the string.

Deyan Lambov · Accepted Answer · 2019-01-09 16:18:40Z

3

    if (fieldName.endsWith(",")) {
        fieldName = fieldName.substring(0, fieldName.length()-1) + " ";
    }

answered Jan 9, 2019 at 16:18

Deyan Lambov

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Comments

Sivabalan · Accepted Answer · 2017-06-19 11:11:25Z

2

StringBuilder replace method can be used to replace the last character.

StringBuilder.replace(startPosition, endPosition, newString)

StringBuilder builder = new StringBuilder(fieldName);
builder.replace(builder.length()-1, builder.length(), "");
builder.toString();

edited Jun 19, 2017 at 11:11

answered Jun 19, 2017 at 3:39

Sivabalan

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Comments

user1188867 · Accepted Answer · 2018-05-17 06:38:56Z

2

You can simply use :

if(fieldName.endsWith(","))
{
   StringUtils.chop(fieldName);
}

from commons-lang

answered May 17, 2018 at 6:38

user1188867

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Comments

Ilya Serbis · Accepted Answer · 2019-10-24 14:58:14Z

org.apache.commons.lang3.StringUtils.removeEnd() and org.springframework.util.StringUtils.trimTrailingCharacter() are your friends:

StringUtils.removeEnd(null, *)      = null
StringUtils.removeEnd("", *)        = ""
StringUtils.removeEnd(*, null)      = *
StringUtils.removeEnd("www.domain.com", ".com.")  = "www.domain.com"
StringUtils.removeEnd("www.domain.com", ".com")   = "www.domain"
StringUtils.removeEnd("www.domain.com", "domain") = "www.domain.com"
StringUtils.removeEnd("abc", "")    = "abc"

    @Test
    public void springStringUtils() {
        String url = "https://some.site/path/";

        String result = org.springframework.util.StringUtils.trimTrailingCharacter(url, '/');

        assertThat(result, equalTo("https://some.site/path"));
    }

Saiteja Parsi · Accepted Answer · 2014-07-02 18:57:56Z

1

you can use regular expressions to identify the last comma (,) and replace it with " " as follow:

if(fieldName.endsWith(","))
{                           
fieldName = fieldName.replace(/,([^,]*)$/," ");
}

answered Jul 2, 2014 at 18:57

Saiteja Parsi

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1 Comment

Chop Over a year ago

Though perfectly correct, your answer is JavaScript. This topic is Java-related.

Kushal · Accepted Answer · 2015-04-21 09:18:27Z

0

Already @Abubakkar Rangara answered easy way to handle your problem

Alternative is :

String[] result = null;
if(fieldName.endsWith(",")) {                           
String[] result = fieldName.split(",");
    for(int i = 1; i < result.length - 1; i++) {
        result[0] = result[0].concat(result[i]);
    }
}

answered Apr 21, 2015 at 9:18

Kushal

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Comments

MGPJ · Accepted Answer · 2013-03-07 10:27:55Z

-6

Modify the code as fieldName = fieldName.replace("," , " ");

answered Mar 7, 2013 at 10:27

MGPJ

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2 Comments

Steven Spasbo Over a year ago

That will replace all occurrences of "," with " ", but they only want the last one to be replaced.

Bhavik Mehta Over a year ago

Do not provide wrong solutions if you can not read/understand question clearly

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