java - String concatenation - Boolean hard-coded Vs Boolean Concatenation with String -

i need advice (both in java & .net) following piece of code.

 public void method(bool value)  {      string somestring;       //some code       if (value)      {           //some code           ...          somestring = "one" + value;                    }      else      {          //some code          ...          somestring = "two" + value;      }   } 

which 1 advisable , why? either code above or code like

somestring = "onetrue"; somestring = "twofalse"; 

after compilation , optimization jdk, method like:

public static string method(boolean value) {     string somestring;      if (value) {         stringbuilder sb = new stringbuilder();         sb.append("one");         sb.append(value);         somestring = sb.tostring();     } else {         stringbuilder sb = new stringbuilder();         sb.append("two");         sb.append(value);         somestring = sb.tostring();     }     return somestring; } 

if code invoked frequently, bring performance impact, compared second version. in each case new stringbuilder constructed , 3 methods invoked on it. , boolean should converted object before calling append. while in second version return constant. depends on how code called.