Ecuación de Segundo Grado (Método General)

Ecuación de Segundo Grado (Método General)

import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class Ecuacion2do extends JFrame{

private static final long serialVersionUID = 1L;
Double A;
Double B;
Double C;
JLabel lblA,lblB,lblC,lblx1,lblx2,lblvA,lblvB,lblvC,lblvDet;
JTextField txtA,txtB,txtC;
JButton btnAceptar, btnCancelar;


public Ecuacion2do() {

setTitle("Solucion");
setSize(250,200);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
dibujarIntefaz();

}

public void dibujarIntefaz() {

getContentPane().setLayout(new GridLayout(7,2));

lblA = new JLabel("Valor de A");
getContentPane().add(lblA);

txtA = new JTextField();
getContentPane().add(txtA);

lblB = new JLabel("Valor de B");
getContentPane().add(lblB);

txtB = new JTextField();
getContentPane().add(txtB);

lblC = new JLabel("Valor de C");
getContentPane().add(lblC);

txtC = new JTextField();
getContentPane().add(txtC);

lblx1 = new JLabel("x1 = ");
getContentPane().add(lblx1);

lblx2 = new JLabel("x2 = ");
getContentPane().add(lblx2);

lblvA = new JLabel("vA");
getContentPane().add(lblvA);

lblvB = new JLabel("vB");
getContentPane().add(lblvB);

lblvC = new JLabel("vC");
getContentPane().add(lblvC);

lblvDet = new JLabel("vDet");
getContentPane().add(lblvDet);

btnAceptar = new JButton("Resolver");
getContentPane().add(btnAceptar);

btnCancelar = new JButton("Cancelar");
getContentPane().add(btnCancelar);


btnCancelar.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
System.exit(0);
}
});

btnAceptar.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {

String msj="";

if(txtA.getText().isEmpty()) {
msj +="Falta el valor de A\n";
}

if(txtB.getText().isEmpty()) {
msj +="Falta el valor de B\n";
}

if(txtC.getText().isEmpty()) {
msj +="Falta el valor de C\n";
}

A = Double.parseDouble(txtA.getText());
B = Double.parseDouble(txtB.getText());
C = Double.parseDouble(txtC.getText());

lblvA.setText("A = " + txtA.getText());
lblvB.setText("B = " +txtB.getText());
lblvC.setText("C = " +txtC.getText());
lblvDet.setText("Det = " + determinante());


if (msj.isEmpty()) {

A = Double.parseDouble(txtA.getText());
B = Double.parseDouble(txtB.getText());
C = Double.parseDouble(txtC.getText());

Double miSol[] = Solucion();

if (miSol[0] == 100.0) {
lblx1.setText("Sin solucion");
lblx2.setText("Sin solucion");
} else {
lblx1.setText("X1 = " + miSol[0].toString());
lblx2.setText("X2 = " + miSol[1].toString());
}


} else {
javax.swing.JOptionPane.showMessageDialog(null, msj);
}
}
});

}

public Double determinante() {
return (B * B - 4 * A * C);
}

public Double[] Solucion()  {

Double Sol[] = new Double[2];

if (determinante() == 0) {
Sol[0] = -B/2*A;
Sol[1] = Sol[0];
}

if (determinante() > 0) {

Sol[0] = (-B + Math.sqrt(determinante()));
Sol[0] = Sol[0]/(2*A);
Sol[1] = (-B - Math.sqrt(determinante()));
Sol[1] = Sol[1]/(2*A);

}


if (determinante() < 0) {
Sol[0] = 100.0;
Sol[1] = Sol[0];
}

return Sol;
}

public static void main(String args[]) {
new Ecuacion2do().setVisible(true);
}

}