How to replace comma (,) with a dot (.) using java

Question

I am having a String str = 12,12 I want to replace the ,(comma) with .(Dot) for decimal number calculation, Currently i am trying this :

 if( str.indexOf(",") != -1 )  {      str.replaceAll(",","\\.");  } 

please help

Answer 1

Your problem is not with the match / replacement, but that String is immutable, you need to assign the result:

str = str.replaceAll(",","."); // or "\\.", it doesn't matter... 

Answer 2

Just use replace instead of replaceAll (which expects regex):

str = str.replace(",", "."); 

or

str = str.replace(',', '.'); 

(replace takes as input either char or CharSequence, which is an interface implemented by String)

Also note that you should reassign the result