If statement to handle unexpected responses from users for guess a number program not working

I am currently working an a "guess a number" project and one of my requirements is to handle unexpected output from the user.I also would want to know where in the code I should put this piece of code because my code feels very disorganized.

Right not I am using an if statement that isn't compiling and i'm not sure why.

while (!text.equals("yes")){
  System.out.println("Is your number " + (guess) + "?");
  System.out.println("yes,higher,or lower");
  text = reader.nextLine();

  if (text.equals("higher")){
    min = guess + 1;
  }

  if (text.equals("lower")){
    max = guess - 1;
  }
  guess = (max + min)/2;

  if (text.equals("yes")){
    System.out.println("Yay! I guessed it.");
  }

  if (!text.equals("yes" || "higher" || "lower" || "ok")){
    System.out.println ("I dont understand " + (text));
    System.out.println("Is your number " + (guess) + "?");
    System.out.println("yes,higher,or lower");
  }
}

DESIRED OUTPUT

Think of a number between 1 and 1000
Type ok when you're ready
 ready
 You said ready
 I guess that means you're ready
 Don't forget your number
Is your number 500?
 yes, higher, or lower
 no
 I don't understand no
 Is your number 500?
 yes, higher, or lower
  lower
 Is your number 250?
 yes, higher, or lower
 yes
Yay! I guessed it
=======
//error with my code
exit status 1
Main.java:38: error: bad operand types for binary operator '||'
      if (!text.equals("yes" || "higher" || "lower" || "ok")){
                         ^
   first type:  String
  second type: String
 1 error