Temperature Conversion

import java.util.Scanner;

public class TemperatureConversion
{

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

        System.out.println("Enter the temperature value: ");
        double temperature = scanner.nextDouble();

        System.out.println("Enter the unit of the temperature (C for Celsius, F for Fahrenheit, K for Kelvin): ");
        char unit = scanner.next().toUpperCase().charAt(0);

        switch (unit) 
{
            case 'C':
                convertFromCelsius(temperature);
                break;
            case 'F':
                convertFromFahrenheit(temperature);
                break;
            case 'K':
                convertFromKelvin(temperature);
                break;
            default:
                System.out.println("Invalid unit entered.");
        }

        scanner.close();
    }

    public static void convertFromCelsius(double celsius) 
{
        double fahrenheit = (celsius * 9/5) + 32;
        double kelvin = celsius + 273.15;
        System.out.println("Celsius: " + celsius + "°C");
        System.out.println("Fahrenheit: " + fahrenheit + "°F");
        System.out.println("Kelvin: " + kelvin + "K");
    }

    public static void convertFromFahrenheit(double fahrenheit)
{
        double celsius = (fahrenheit - 32) * 5/9;
        double kelvin = (fahrenheit - 32) * 5/9 + 273.15;
        System.out.println("Fahrenheit: " + fahrenheit + "°F");
        System.out.println("Celsius: " + celsius + "°C");
        System.out.println("Kelvin: " + kelvin + "K");
    }

    public static void convertFromKelvin(double kelvin) 
{
        double celsius = kelvin - 273.15;
        double fahrenheit = (kelvin - 273.15) * 9/5 + 32;
        System.out.println("Kelvin: " + kelvin + "K");
        System.out.println("Celsius: " + celsius + "°C");
        System.out.println("Fahrenheit: " + fahrenheit + "°F");
    }
}