import java.util.Scanner; public class minus { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("The number is: "); String userInput = input.nextLine(); while (userInput != "-1"){ System.out.println(userInput); System.out.println("the number is? "); userInput = String.valueOf(input.nextDouble()); System.out.println("done!"); } }}

I am confused on the while loop using string