package Lecture8;

public class StaticExample {
    public static void main(String[] args) {
        GrayBody one= new GrayBody(315.0, 0.03, 0.9);
        GrayBody two= new GrayBody(165.0, 100000.0, 1.0);
        double heat12= one.heatFlow(two);
        int id= one.getID();
        System.out.println("Object 1 ID: " + id + "\nFlujo de calor (miembro): " + heat12);
        double heat12x= GrayBody.heatFlow(315.0, 0.03, 0.9, 165.0, 1000000.0, 1.0);
        System.out.println("Flujo de calor (estático): " + heat12);
        System.out.println("ID del objeto 2: " + two.getID());
        System.exit(0);
    }
}

class GrayBody {
    public static final double STEFAN_BOLTZMANN= 5.669E-8;  // W/m^2-K^4
    private double temp;                                    // Kelvin
    private double surfaceArea;                             // m^2
    private double surfaceEmissivity;                       // 0-1
    static private int nextID= 8;                           // Campo de la clase
    private int ID;                                         // Campo miembro
    GrayBody(double t, double sa, double se) {
        temp= t;
        surfaceArea= sa;
        surfaceEmissivity= se;  
        ID= nextID++;
    }
    public double getTemp() { return temp;}
    public double getSurfaceArea() {return surfaceArea; }
    public double getSurfaceEmissivity() {return surfaceEmissivity;}
    public int getID() {return ID; }
    // Método miembro (en este ejemplo simple no se han utilizado todos los campos)
    public double heatFlow(GrayBody other) {
        double ot= other.getTemp();
        return STEFAN_BOLTZMANN / (1+(1-surfaceEmissivity)/surfaceEmissivity)*
            surfaceArea*(temp*temp*temp*temp - ot*ot*ot*ot);
    }
    // Método de la clase (en este ejemplo simple no se han utilizado todos los campos)
    static public double heatFlow(double t1, double sa1, double se1, double t2, double sa2, double se2) {
        return STEFAN_BOLTZMANN / (1+(1-se1)/se1)*
            sa1*(t1*t1*t1*t1 - t2*t2*t2*t2);
    }
}