Test.java

import java.util.Scanner;

public class Test {
    public static float toFahrenheit(int celcius) {
        return (celcius * 9 / 5) + 32;
    }

    public static float toCelcius(int fahrenheit) {
        return (fahrenheit - 32) * 5 / 9;
    }

    public static void main(String[] args) {
        Scanner sc = null;
        try {
            sc = new Scanner(System.in);
            boolean flag = true;
            while (!flag) {
                System.out.print("Pilih suhu yang dituju: \n1. Fahrenheit\n2. Celcius\n3. Exit\n> ");
                int choices = sc.nextInt();
                switch (choices) {
                    case 1:
                        System.out.print("Masukkan suhu awal (celcius): ");
                        int celcius = sc.nextInt();
                        System.out.println(celcius + "\\U+2103" + "= " + toFahrenheit(celcius) + "\\U+2109\nAgain? (y/n)\n> ");
                        char loop1 = sc.next().charAt(0);
                        if(loop1 == 'n' || loop1 != 'y'){
                            flag = false;
                        }
                        break;
                    case 2:
                        System.out.print("Masukkan suhu awal (fahrenheit): ");
                        int fahrenheit = sc.nextInt();
                        System.out.println(fahrenheit + "\\U+2109" + "= " + toCelcius(fahrenheit) + "\\U+2103\nAgain? (y/n)\n> ");
                        char loop2 = sc.next().charAt(0);
                        if(loop2 == 'n' || loop2 != 'y'){
                            flag = false;
                        }
                        break;
                    default:
                        flag = false;
                        break;
                }
            }
        } finally {
            if (sc != null) {
                sc.close();
            }
        }
    }
}