Question

How to convert between Fahrenheit, Celsius, and Kelvin in Java

Answer 1

public class Main {

    public static void temperatureConvert(double temperature, char unitType, double[] results) {
        switch (unitType) {
            case 'c':
                results[0] = ((9.0 / 5.0) * temperature) + 32; // Fahrenheit
                results[1] = (temperature + 273.15); // Kelvin
                break;
            case 'f':
                results[0] = (temperature - 32) / 1.8; // Celsius
                results[1] = (temperature - 32) * 5 / 9.0 + 273.15; // Kelvin
                break;
            case 'k':
                results[0] = (temperature - 273.15); // Celsius
                results[1] = (((9.0 / 5.0) * temperature) - 459.67); // Fahrenheit
                break;
            default:
                results[0] = results[1] = 0;
        }
    }

    public static void main(String[] args) {
        double[] result = new double[2];

        temperatureConvert(24, 'c', result);
        System.out.println("Fahrenheit is: " + result[0] + " degrees\n" +
                "Kelvin     is: " + result[1] + " degrees\n");

        temperatureConvert(3, 'f', result);
        System.out.println("Celsius is: " + result[0] + " degrees\n" +
                "Kelvin  is: " + result[1] + " degrees\n");

        temperatureConvert(3, 'k', result);
        System.out.println("Celsius    is: " + result[0] + " degrees\n" +
                "Fahrenheit is: " + result[1] + " degrees\n");
    }
}




/*
run:
    
Fahrenheit is: 75.2 degrees
Kelvin     is: 297.15 degrees

Celsius is: -16.11111111111111 degrees
Kelvin  is: 257.0388888888889 degrees

Celsius    is: -270.15 degrees
Fahrenheit is: -454.27000000000004 degrees

*/

 

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