If statement cannot find symbol java

I'm working on if statement on java but I keep on getting cannot find symbol error

I know the mistake is "input.nextString();" but when I get rid of the string and leave it as input.next(); & input the userid and password it gives me the false output Admin Login Password is incorrect!, not the true output Admin User Logged In, how can I fix it?

import java.util.Scanner; public class Login {

public static void main(String args[]) {
    Scanner input = new Scanner(System.in); // input scanner

    // Prompt the user to enter userid and password
    String userid = "admin";
    String password = "ctc";

    System.out.println("Enter your userid:");
    userid = input.nextString();

    System.out.println("Enter your password:");
    password = input.nextString();

    if(userid == ("admin") && (password == ("ctc"))){
        System.out.println("Admin User Logged In");
    }
    else {
        System.out.println("Admin Login Password is incorrect!");
    }
}

}