Calcul de température en Java?

Question

Fondamentalement, la tâche consiste à calculer la température d'un objet chaud après l'avoir placé dans un congélateur. La température du congélateur est constante à -20 degrés. Une fois l'objet dans le congélateur, sa température baisse de (K * dt) degrés par seconde, où K = 0,001 et dt est la différence entre la température de l'objet actuel et la température du congélateur. Cette méthode devrait pouvoir calculer la température de l'objet (à une température initiale donnée) après qu'il ait été dans le congélateur pendant un certain nombre de secondes.

La solution doit comporter une boucle qui calcule la température changeante de l'objet, seconde par seconde. Dans chaque seconde, la température devrait baisser de (K * dt) où dt est la différence entre la température de l'objet courant (comme c'est le cas au début de cette seconde) et la température du congélateur. voici mon code:

import java.util.Scanner; 

public class Cooling { 

    public static final double FREEZER_TEMPERATURE = -20; 
    public static final double K = 0.001; 

    public static void main(String[] args) { 
     temperatureTest(70, 0); 
     temperatureTest(70, 60); 
    } 

    public static double temperature(double initialTemperature, int seconds) { 
     double x = initialTemperature; 
     int y = seconds; 
     double dt = (x - FREEZER_TEMPERATURE); 
     return K*dt*y ; 
    } 

Mon problème est que je ne sais pas comment le mettre en œuvre dans une boucle. Toute aide serait appréciée :). Je vous remercie :).

Answer 1

public static void main(String[] args) { 

    for(int t = 0, t < NUMBER OF SECONDS YOU WANT; t++) { 
     temperatureTest(YOUR INITIAL TEMP, t); 
    } 
} 

Answer 2

Cette méthode le ferait. J'ai ajouté l'instruction d'impression afin que vous puissiez voir la progression, mais vous voudrez l'enlever.

public static double temperature(double initialTemperature, int seconds) { 
    double currentTemp = initialTemperature; 
    for (int time = 1; time <= seconds; time++) { 
     currentTemp -= K * (currentTemp - FREEZER_TEMPERATURE); 
     System.out.printf("After %d seconds, temperature is %f%n", time, currentTemp); 
    } 
    return currentTemp; 
} 

test

System.out.println(temperature(70, 60)); 

Sortie

After 1 seconds, temperature is 69.910000 
After 2 seconds, temperature is 69.820090 
After 3 seconds, temperature is 69.730270 
After 4 seconds, temperature is 69.640540 
After 5 seconds, temperature is 69.550899 
After 6 seconds, temperature is 69.461348 
After 7 seconds, temperature is 69.371887 
After 8 seconds, temperature is 69.282515 
After 9 seconds, temperature is 69.193232 
After 10 seconds, temperature is 69.104039 
After 11 seconds, temperature is 69.014935 
After 12 seconds, temperature is 68.925920 
After 13 seconds, temperature is 68.836994 
After 14 seconds, temperature is 68.748157 
After 15 seconds, temperature is 68.659409 
After 16 seconds, temperature is 68.570750 
After 17 seconds, temperature is 68.482179 
After 18 seconds, temperature is 68.393697 
After 19 seconds, temperature is 68.305303 
After 20 seconds, temperature is 68.216998 
After 21 seconds, temperature is 68.128781 
After 22 seconds, temperature is 68.040652 
After 23 seconds, temperature is 67.952611 
After 24 seconds, temperature is 67.864659 
After 25 seconds, temperature is 67.776794 
After 26 seconds, temperature is 67.689017 
After 27 seconds, temperature is 67.601328 
After 28 seconds, temperature is 67.513727 
After 29 seconds, temperature is 67.426213 
After 30 seconds, temperature is 67.338787 
After 31 seconds, temperature is 67.251448 
After 32 seconds, temperature is 67.164197 
After 33 seconds, temperature is 67.077033 
After 34 seconds, temperature is 66.989956 
After 35 seconds, temperature is 66.902966 
After 36 seconds, temperature is 66.816063 
After 37 seconds, temperature is 66.729247 
After 38 seconds, temperature is 66.642517 
After 39 seconds, temperature is 66.555875 
After 40 seconds, temperature is 66.469319 
After 41 seconds, temperature is 66.382850 
After 42 seconds, temperature is 66.296467 
After 43 seconds, temperature is 66.210170 
After 44 seconds, temperature is 66.123960 
After 45 seconds, temperature is 66.037836 
After 46 seconds, temperature is 65.951798 
After 47 seconds, temperature is 65.865847 
After 48 seconds, temperature is 65.779981 
After 49 seconds, temperature is 65.694201 
After 50 seconds, temperature is 65.608507 
After 51 seconds, temperature is 65.522898 
After 52 seconds, temperature is 65.437375 
After 53 seconds, temperature is 65.351938 
After 54 seconds, temperature is 65.266586 
After 55 seconds, temperature is 65.181319 
After 56 seconds, temperature is 65.096138 
After 57 seconds, temperature is 65.011042 
After 58 seconds, temperature is 64.926031 
After 59 seconds, temperature is 64.841105 
After 60 seconds, temperature is 64.756264 
64.75626360008506 

Answer 3

for(int i =0; i<seconds; i++) 
{ 
     currentTemp -= currentTemp*K*(currentTemp - FREEZER_TEMPERATURE); 
}