Tugas program java kedua

Baiklah kali ini saya akan membuat program Java menggunakan SquareEquationToy. Berikut adalah listing programnya:

import javax.swing.*;

public class SquareEquationToy {

  private double a;

  private double b;

  private double c;

  private double x1;

  private double x2;

private boolean fValid = false;

    public SquareEquationToy()
{                    

String input = JOptionPane.showInputDialog("masukan nilai a");

double a = Double.parseDouble(input);

System.out.println("nilai a = " + a);

String Input = JOptionPane.showInputDialog("masukan nilai b");

double b = Double.parseDouble(Input);

System.out.println("nilai b = " + b);

String iNput = JOptionPane.showInputDialog("masukan nilai c");

double c = Double.parseDouble(iNput);

System.out.println("nilai c = " + c);

this.a = a;

this.b = b;

this.c = c;

calcX();

}

  

private double calcDiscriminant(){

return b*b - 4*a*c;

}

  

private void calcX(){

double d = calcDiscriminant();

if (d > 0) {

x1 = (-b + Math.sqrt(d))/(2*a);

x2 = (-b - Math.sqrt(d))/(2*a);

fValid = true;

}

}

               

public boolean isValid(){

return fValid;

}

               

public double getA(){

return a;

}

               

public double getB(){

return b;

}

               

public double getC(){

return c;

}

               

public double getX1(){

return x1;

}

               

public double getX2(){

return x2;
}

               

static void test(){

SquareEquationToy s = new SquareEquationToy ();

if (s.isValid()){

System.out.println("Persamaan "+s.getA()+"X^2 "+s.getB()+"X"+s.getC() + " mempunyai akar "+s.getX1()+"dan"+s.getX2());

}

else {

System.out.println("Persamaan "+s.getA()+"X^2 "+s.getB()+"X"+s.getC() + " Tidak mempunyai akar-akar riil");

}

}

                               

public static void main (String[]args){

test();

System.exit(0);

}
}

Mudah bukan program tersebut?jika program tidak berjalan dengan baik,coba anda koreksi besar atau kecilnya huruf yang anda gunakan,karena program ini sangat sensitif.

SELAMAT MENCOBA ^.^