3 replies to this topic

[abderrahim]

Hi everybody, How can I add a chat into a string in specific place, why can't this method do it:

char[] word2;

String word;

word[j]=word2.charAt(i);

-------
or this
--------

String word;

String word2;

char c;

for (int i=0;i<word.length();i++)if (c=word.charAt(i)=='P'){word2.concat(valueOf(c));j++;}

---------- Post added 01-07-2012 at 12:21 AM ---------- Previous post was 01-06-2012 at 11:13 PM ----------

Any way I found the solution for anyone who would make the same mistake, Here it is, it should be

char[] word = {};

String word2 = " ";


word[j]=word2.charAt(i);

[Sinipull]

String is immutable object - you can't change it after it's created. (To avoid major pitfalls and bugs)
also, you can't address any of the characters in the String like you access an array, this isn't C.

The "solution", you provided is incorrect. Because "word" is array of characters, not a String.
I think there isn't obvious solution, but maybe the shortest way goes like this:

String word = "Hello";
String word2 = word.substring(0, 1)+"a"+word.substring(2); 

word2 is set to "Hallo".

[abderrahim]

Ok Sinipull, thank you so much, I think I got it.

[lethalwire]

How about using a StringBuilder object?

StringBuilder sb = new StringBuilder("abcdfg");

sb.insert(4, 'e');

System.out.println(sb.toString());