[Java] ZadanieRównanieKwadratowe

package rownanieKwadratowe;

/**
 *
 * @author Student
 */
public class Main {
    public static void main(String[] args) {
        QuadraticEquation n = new QuadraticEquation(1,0,-4);


        try{
            System.out.println("Wynik = " + n.getResult(0)+ " " + n.getResult(1));
        }catch (Exception e){
            System.out.println("Delta ujemna");
            e.printStackTrace(System.out);
        }

        System.out.println("a = " + n.getA());
        System.out.println("b = " + n.getB());
        System.out.println("c = " + n.getC());
        System.out.println("delta = " + n.getDelta());
       }

}

/*--------------------------------------------------------------------------------------------------------------*/

package rownanieKwadratowe;

public class QuadraticEquation {
    private double a;
    private double b;
    private double c;
    private double delta;
    private double[] result = new double[2];

    public QuadraticEquation(double a, double b, double c){
        this.a = a;
        this.b = b;
        this.c = c;
        quadraticEquation();
    }

    private void quadraticEquation(){
        double a = this.a;
        double b = this.b;
        double c = this.c;
        double delta;
        double[] result = new double[2];

        delta = Math.pow(b,2) - (4*a*c);
        this.delta=delta;
    }

    private void calcResults() throws Exception{
        double delta = this.delta;
        if(delta>0)
        {
            result[0] = (-b - Math.sqrt(delta)/2*a);
            result[1] = (-b + Math.sqrt(delta)/2*a);
        }
        else if(delta==0){
            result[0] = -b/2*a;
        }
        else throw new Exception("Delta jest ujemna - Brak Rozwiazan");
        this.result = result;
    }

    /*
    ---Variable A
    */
    public double getA() {
        return a;
    }

    public void setA(double a) {
        this.a = a;
        quadraticEquation();
    }
     /*
    ---Variable B
    */
    public double getB() {
        return b;
    }

    public void setB(double b){
        this.b = b;
        quadraticEquation();
    }
     /*
    ---Variable C
    */
    public double getC() {
        return c;
    }

    public void setC(double c){
        this.c = c;
        quadraticEquation();
    }
     /*
    ---Variable Delta
    */
    public double getDelta() {
        return delta;
    }

        /*
    ---Variable Result
    */
    public double getResult(int x) throws Exception{
        calcResults();
        return result[x];
    }


}