java - replace a char in String -

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Hi, I want to change one to four in the string. My problem is that before you do not know which character it is, so in some cases I get an error message when my four example is for example '+' I do not want to have my four as regex To be defined, what should I do?

May code should be something like this: 

  string test = "something"; char ca = input.chatAt (0); Input = input.replaceAll ("" + ca, "");   
 I hope you can help me.   
 
 
 just don 'then use regex.  
  input = input.replace (String.valueOf (ca), "");   
  copying all  method  string  takes a  string  representation of a regular expression as an argument.  
  Change  is not the method.  
 View.

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