java - Prevent duplicate values in an array -

how can ask user reenter again if value pid existed in array ?

ex: enter b , enter again, entered last not accepted because it's existed.

int[] process = {}; int numberofprocess = 0;   string[] pid = new string[10]; //proces id   system.out.print("enter number of process 1 10 : ");     while(berror){         if(scan.hasnextint()){             numberofprocess = scan.nextint();         }else{               scan.next();             continue;         }             berror = false;      } //----------------  ask user input process id @ , ex -------  for(int i=0;numberofprocess > i;i++){      system.out.print("please enter processid " + (i + 1) + " : ");         pid[i] = scan.next();   } 

i'd not use array linkedhashset (assuming want preserve input order). check using set's contains(...) method or try add pid using add(...) , check return value (false if has not been added, i.e. if existed in set).