If statement not equal to

``` import java.util.Scanner; public class RockPaperScissors { public static void main (String[] args) { Scanner scan = new Scanner (System.in); System.out.println("Player 1: Choose rock, paper or scissors: "); String Player1 = scan.next().toLowerCase(); System.out.println("Player 2: Choose rock, paper or scissors: "); String Player2 = scan.next().toLowerCase(); System.out.println ("Player 1 chose " + Player1); System.out.println ("Player 2 chose " + Player2); if (Player1.!equals("rock" + "paper" + "scissors") { System.out.println ("Please insert either Rock Paper or Scissors!); } if (Player1.equals(Player2)) { System.out.println ("Its a tie!"); } if ((Player1.equals("rock")) && (Player2.equals("paper"))) { System.out.println ("Player 2 wins!"); } else if ((Player1.equals("paper")) && (Player2.equals("rock"))) { System.out.println ("Player 1 wins!"); } if ((Player1.equals("scissors")) && (Player2.equals("paper"))) { System.out.println ("Player 1 wins!"); } else if ((Player1.equals("paper")) && (Player2.equals("scissors"))) { System.out.println ("Player 2 wins!"); } if ((Player1.equals("rock")) && (Player2.equals("scissors"))) { System.out.println ("Player 1 wins!"); } else if ((Player1.equals("scissors")) && (Player2.equals("rock"))) { System.out.println ("Player 2 wins!"); } } ``` } I have made a simple Rock Scissors Paper game, however I want to implement validation so the user will be notified if they enter anything other than Rock Paper Scissors. I had a go with `.!equals` however I'm getting an error saying `<identifier>` expected. Thanks!