Append a single character to a string or char array in java?

Question

Is it possible to append a single character to the end of array or string in java. Example:

private static void /*methodName*/ () {            
    String character = "a"
    String otherString = "helen";
    //this is where i need help, i would like to make the otherString become 
    // helena, is there a way to do this?               
}

i have tried the append method but i am very confused about how to use it... — CodeLover
– CodeLover, Commented Jan 21, 2013 at 18:12
So how have you tried to use the append method? And have you tried simple string concatenation via +? Note that strings and arrays are entirely different things... — Jon Skeet
– Jon Skeet, Commented Jan 21, 2013 at 18:13
Sinnce they are string you can use the builtin string concatenation mechanism of the language by doing otherString + character here. — fge
– fge, Commented Jan 21, 2013 at 18:13
You are thinking of the StringBuilder class with the append method. — squiguy
– squiguy, Commented Jan 21, 2013 at 18:13
Show more research effort. Don't post a question here every time you forget something/want to know some basic operation/method. — keyser
– keyser, Commented Jan 21, 2013 at 18:18

Android Killer · Accepted Answer · 2013-01-21 18:13:10Z

124

1. String otherString = "helen" + character;

2. otherString +=  character;

answered Jan 21, 2013 at 18:13

Android Killer

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Comments

Thomas Keene · Accepted Answer · 2013-09-19 23:22:57Z

11

You'll want to use the static method Character.toString(char c) to convert the character into a string first. Then you can use the normal string concatenation functions.

answered Sep 19, 2013 at 23:22

Thomas Keene

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Comments

tom redfern · Accepted Answer · 2016-10-13 14:08:33Z

9

new StringBuilder().append(str.charAt(0))
                   .append(str.charAt(10))
                   .append(str.charAt(20))
                   .append(str.charAt(30))
                   .toString();

This way you can get the new string with whatever characters you want.

edited Oct 13, 2016 at 14:08

tom redfern

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answered Oct 13, 2016 at 12:19

Ankit Jain

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Comments

Bogdan M. · Accepted Answer · 2014-01-15 11:51:50Z

3

First of all you use here two strings: "" marks a string it may be ""-empty "s"- string of lenght 1 or "aaa" string of lenght 3, while '' marks chars . In order to be able to do String str = "a" + "aaa" + 'a' you must use method Character.toString(char c) as @Thomas Keene said so an example would be String str = "a" + "aaa" + Character.toString('a')

answered Jan 15, 2014 at 11:51

Bogdan M.

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Comments

skmangalam · Accepted Answer · 2018-07-28 17:50:08Z

3

And for those who are looking for when you have to concatenate a char to a String rather than a String to another String as given below.

char ch = 'a';
String otherstring = "helen";
// do this
otherstring = otherstring + "" + ch;
System.out.println(otherstring);
// output : helena

answered Jul 28, 2018 at 17:50

skmangalam

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3 Comments

Elletlar Over a year ago

Thanks for your answer, but I'd advise reviewing how this works in Java. The accepted answer works regardless of whether the variable named character is a 'char' or a 'String' and the empty String in your answer: [otherstring + "" + ch] is unnecessary. Also, I do not think that this question requires another new answer as the existing answers provide sufficient coverage.

skmangalam Over a year ago

I answered this question because if you look closely, you will find out that the question title is a little vague and is not related to the question which user intended to ask and I tried to answer exactly that. cheers!!

Antroid Over a year ago

The need of adding an empty. "" in the line otherstring = otherstring + "" + ch; is totally useless.

Alya'a Gamal · Accepted Answer · 2013-01-21 18:13:53Z

2

just add them like this :

        String character = "a";
        String otherString = "helen";
        otherString=otherString+character;
        System.out.println(otherString);

answered Jan 21, 2013 at 18:13

Alya'a Gamal

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Comments

yugantar · Accepted Answer · 2015-03-24 07:27:15Z

0

public class lab {
public static void main(String args[]){
   Scanner input = new Scanner(System.in);
   System.out.println("Enter a string:");
   String s1;
   s1 = input.nextLine();
   int k = s1.length();
   char s2;
   s2=s1.charAt(k-1);
   s1=s2+s1+s2;
   System.out.println("The new string is\n" +s1);
   }
  }

Here's the output you'll get.

* Enter a string CAT The new string is TCATT *

It prints the the last character of the string to the first and last place. You can do it with any character of the String.

edited Mar 24, 2015 at 7:27

answered Mar 24, 2015 at 5:18

yugantar

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