package Lecture7;

public class SpringExample {
    public static void main(String[] args) {
        Spring one= new Spring("aluminio", 2.0, 1.0, 5.0);
        Spring two= new Spring(5.0, 3.0);
        Spring three= new Spring();
        double f1= one.getForce(0.5);
        double f2= two.getForce(1.5);
        double f3= three.getForce(0.1);
        System.out.println("f1: " + f1 + "\nf2: " + f2 + "\nf3: " + f3);
        double f4= one.getForce();
        double f5= two.getForce();
        double f6= three.getForce();
        System.out.println("f4: " + f4 + "\nf5: " + f5 + "\nf6: " + f6);        
        System.exit(0);                
    }
}

class Spring {
    private String material= "acero";       // Initializada
    private double length;
    private double maxDeflect;
    private double k;

    public Spring(String m, double len, double md, double k) {
        material= m;
        length= len;
        maxDeflect= md;
        this.k= k;
    }
    
    public Spring(double len, double k) {
        this("acero", len, 0.25*len, k);
    }
    
    public Spring(double len) {
        this(len, 0.5*len);
    }
    
    public Spring() {
        this(10.0);
    }
    
    public String getMaterial() { return material; }
    public double getLength() { return length; }
    public double getMaxDef() { return maxDeflect; }
    public double getK() { return k; }

    public void setMaterial(String m) {material= m; }
    public void setLength(double len) {length= Math.abs(len); }
    public void setMaxDef(double m) {maxDeflect= Math.abs(m); }
    public void setK(double k) {this.k= k; }
    
    public double getForce(double deflect) {
        if (deflect > maxDeflect)
            deflect= maxDeflect;
        return k*deflect;
    }
    public double getForce() {
        return k*maxDeflect;
    }
}