java - How to add a String with a loop -

update 3: solved, thank you

update 2: ok close isn't printing tails

update dont want use stringbuilder havn't learned concept. cannot figure out wrong , how add 1 r

hello trying figure out how assignment asked int user input , generate number of coin flips in string form resulting in pattern of hhththttthhhh etc depending on input user chose.

final update solved:

public class stringaddition{ public static void main(string[] args)  { system.out.println(coinflip(8)); }  public static string coinflip(int a){ string r =""; for(int = 0; < a; i++){     int coin = (int) (math.random() * 2);     if (coin == 0) {         string 1 = "t";     r+=one;     }      else if (coin == 1){         string 1 = "h";     r +=one; }  } return r; }   } 

you have declare empty string outside of loop, , add inside loop. += less efficient stringbuilder, here solution

public static string coinflip(int a){     stringbuilder sb = new stringbuilder();     for(int = 0; < a; i++){         int coin = (int)(math.random() * 2);         sb.append(coin == 0 ? "t" : "h");  // if-else      }     return sb.tostring(); }