问我怎样才能让程序在不重置的情况下使用不同的变量呢？

EN

import java.util.Scanner;

public class TemperaturTo {
    public static void main(String[] args) {

    // lager en variabel for Fahrenheit / making a variable for Fahrenheit
    Scanner keyboard = new Scanner(System.in);
    String answer = null;

    do {
        System.out.println("Skriv fahrenheit: ");
        float fahrenheit = keyboard.nextInt();

        // lager formelen for Celsius ved gitt fahrenheit / implement the
        // formula for Celsius

        double celsius = (fahrenheit - 32) / 1.8;

        // skriver ut et resultat / write out the result

        System.out.println("Temperatur gitt i fahrenheit:  " + fahrenheit);
        System.out.println("Temperatur i Celsius: " + celsius);

        if (celsius > 30 && celsius < 50) {
            System.out.println("Det var for varmt");
        } else if (celsius < 30 && celsius > 25) {
            System.out.println("Dette var kanskje for varmt");
        } else if (celsius == 25) {
            System.out.println("Dette var akkurat passelig");
        } else if (celsius < 20 && celsius >= 0) {
            System.out.println("Dette var litt for kaldt");
        } else if (celsius < 0 && celsius > -20) {
            System.out.println("Kaldt!");
        } else if (celsius == -273) {
            System.out.println("Det absolutte nullpunkt!");
        } else {
            System.out.println("Dette har jeg ingen kommentar om");

        }
        System.out.println("Do you want to continue?(Y/N) ");
        answer = keyboard.next();
        while (!answer.equalsIgnoreCase("Y")
                && !answer.equalsIgnoreCase("N")) {
            System.out.println("Please answer with Y or N: ");
            answer = keyboard.next();
        }

    } while (answer.equalsIgnoreCase("Y"));
}