Why while(true) loop in java repeat two times? And why the condition at the end doesn't work?

Question

this is my java program that should ask you what you want to do with the array 'drugs' which contain some strings. But when I run it the while loop repeats 2 times before ask me to digit 'q' to exit... end when I press q key the condition ignore this. I'm new in java and I'm begin crazy with that, thanks for support.

public static void main(String[] args){
    Scanner input = new Scanner(System.in);
    System.out.println("This program will show the array \'drugs\' in different way, using functions\n\n");

    printMenu();
    System.out.print(">>");
    int ans = input.nextInt();

    String[] drugs = {"LSD", "cocaine", "weed", "eroine(white)", "eroine(brown)", "hashish", "extasi"};

    String ans2 = "";
    while(true){
      switch(ans){
        case 1:
          printArray(drugs);
          break;
        case 2:
          printArrayReverse(drugs);
          break;
        case 3:
          shiftOnLeft(drugs);
          break;
        case 4:
          break;
        default:
          System.out.println("Insert a valid number\n");
          break;
      }
      System.out.print("\n\n[Press q to quit or enter key to repeat the loop again]");
      ans2 = input.nextLine();

      if(ans2 == "q"){
        break;
      }
    }
  }