Why does the instruction in Java not work correctly?

Question

Java

import java.util.Scanner;

public class test {
    static public void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Желаете еще партейку? y/n");
        String answer = scanner.nextLine();
        if (answer == "yes" || answer == "y") {
            System.out.println("ок");
        } else {
            System.out.println(answer);
            System.out.println("Не правильно");

        }
    }
}

Answer 1

Strings are compared using the equals method.
For example: answer.equals("yes") , or even better "yes".equals(answer)

Answer 2

First, in Java everything works correctly.
Secondly, there are no instructions in Java.
Thirdly, it’s still useful to write not in a notepad, but in an id
. Fourthly, you don’t know what “==” is