In Java, how to replace a symbol occurring in multiple places in the string by another symbol at all instances? -

i have written method replace first instance of given symbol symbol in given string.

i modify method replace instances of old symbol given new symbol in string.

public static string myreplace(string origstring, string oldvalue, string newvalue) {     char[] chars = origstring.tochararray();     char[] charsnewvalue = newvalue.tochararray();      stringbuffer sb = new stringbuffer();      int startpos = origstring.indexof(oldvalue);     int endpos = startpos + oldvalue.length();     int lengthofstring = origstring.length();     if (startpos != -1) {         (int = 0; < startpos; i++)             sb.append(chars[i]);         (int = 0; < newvalue.length(); i++)             sb.append(charsnewvalue[i]);         (int = endpos; < lengthofstring; i++)              sb.append(chars[i]);     }      else          return toreplaceinto;     return sb.tostring(); } 

just use string.replace. you've asked for:

replaces each substring of string matches literal target sequence specified literal replacement sequence.

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slightly ot, method replacing first match more complex required, well:

private static string replaceone(string str, string find, string replace) {     int index = str.indexof(find);     if (index >= 0)     {         return str.substring(0, index) + replace + str.substring(index + find.length());     }     return str; } 

tests:

system.out.println(replaceone("find xxx find", "find", "rep")); // "rep xxx find" system.out.println(replaceone("xxx xxx find", "find", "rep"));  // "xxx xxx rep" system.out.println(replaceone("xxx find xxx", "find", "rep"));  // "xxx rep xxx" system.out.println(replaceone("xxx xxx xxx", "find", "rep"));   // "xxx xxx xxx"